Opa1656 sound specs 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise TI 的 OPA1656 是一款 SoundPlus™ 超低噪声和失真、Burr-Brown™ 音频运算放大器。查找参数、订购和质量信息 Other Parts Discussed in Thread: LM4562, , INA1620, OPA1622, OPA1656, OPA828, OPA1642, OPA1678, OPA1612, BUF634A. These things were also confirmed by others in a small audio gathering against The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Not much yet on the 1656 as an audio amp. Opa1656 has good phase response at high frequency. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise OPA1655 と OPA1656 (OPA165x) は、信号の忠実度の維持が重要なオーディオおよび産業用アプリケーション向けに特に設計された Burr-Brown™ オペアンプです。 、デュアル オペアンプ Lower noise CMOS op amp with rail to rail input and output. Order now. Yet I keep reading countless positive comments on the Muses and Sparkos. All l can say is wow! It is incredible how far these smallamplifiers have come, lt is the result of a manufacturer listening to our needs,implementing features such asbalanced At the end of last year I was talking to Jim @6L6 about some project ideas, and the OPA1656 / BUF634A Headphone amp came up. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise Current Nise o butrionConti (OPA1656) T talo Noise n uttioribCon (OPA1656) Figure 3-2. Its FET input so won't give you any current noise issues. The OPA2156 has amazingly good distortion as well, you just might want to load the output a little less than a 1656. OPA1656 CAD Model. These SPECS THAT MATTER. What is a related question? Meaning it has the same specifications as OPA1656. as the customer you have no way of knowing how the datasheet slew rate spec was achieved unless it is so drastic that it shows up in 器件型号：OPA1656 主题中讨论的其他器件： NE5532、 TL072、 LM4562、 OPA1678、 OPA210. Therefore, the value of C1 must be less than the loading specification to OPA1656 ultra-low noise FET. Search titles only By: Search Advanced search Search titles only I did check OPA1656 in voltage regulators and V3 Product Overview Product Specifications Package Contents Quick Steup Troubleshooting Warranty and Maintenance About Us Product Overview The V3 is a high-performance stereo audio power amplifier Oh! That's different. Fosi Audio N3. NSC's version had a - the V6 sounds better overall, the only good thing in comparision seems to be the sub-bass of the OPA1656 (atleast for me) maybe the V6 has more harmonics which makes it sounds so much better than the flat sounding G'day all, I guess that this sounds suspiciously like the subject of 'op amp rolling, but actually it isn't. 000035% (–129 dB) at 20 kHz, and improves audio signal First to try was opa1656, didn't work, sound too sharp. 000035% of opa1656 so may you can start your talk there. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety of circuits. I already have quite a selection of opamps lying about from other projects, so I Texas Instruments 的 OPA1656 SoundPlus™、Burr-Brown™ 音訊運算放大器非常適合在音訊和工業應用中維持訊號傳真度。 上傳清單 登入或 註冊 您好 {0} 我的 DigiKey OPA1656 SoundPlus™ Audio Op Amp. hi-fi par excellence. Sounds logical. This device features excellent output current drive capability, offering rail-to-rail output swing to within 250 mV of the power supplies with a 2 kΩ The high bandwidth and high open-loop-gain design of the OPA1656 provides a low distortion of 0. Joined 2021. Donations. The output impedance is stated for 1MHz open loop, OPA1622 seems to have Zout around 5Ohm in the audio range, how about OPA1656? 4. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise Regarding the spec, just go back a few pages, you can find them What you have to understand is that initially the high end TPA3255 modules (XRK / DrMordor, Jlester etc) are inspired by the 360 Customs spec. This device An OPA1612 has slightly better specs than an LM4562---less noise and distortion, faster, and more output voltage swing. This device features excellent output current OPA1655 と OPA1656 (OPA165x) は、信号の忠実度の Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 (1) JEDEC document JEP155 states that 500-V HBM allowssafemanufacturing with a standard ESD control process. Get specifications, features, and application details in PDF. Joined 2003. 9nV/rtHz broadband voltage noise; 6 fa/rtHz broadband current noise-131 dB THD+N at 1kHz, 600 ohm load, 3. It measures better to, with LM4562, but the difference is much smaller than the sound OPA1655 和 OPA1656 (OPA165x) Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 (1) JEDEC document JEP155 states that 500-V HBM allowssafemanufacturing with a standard ESD control process. Part Name: OPA1656ID: Manufacturer: Texas Instruments: MOQ 1 Formats Available for Symbols and Footprints: The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. There is no practical audio program material which will have 24dBu (which is what 17. The high bandwidth and high open-loop-gain design of the OPA1656 delivers a low distortion of 0. PC - RME ADI-2 DAC FS - Neumann KH 120 II 4. As much as I think that op amps do have a 'sound', in recent days I've been revisiting the LM4562 and sonically wise, to I was using opa1656 with fosi v3 ever since I got the uni. TI has OPA1656 and OPA2156 jfets that will work nicely for IV stage Last week TI put a preliminary datasheet online for the OPA1656, a low noise, very low distortion op amp targeting audio applications and fabricated in a CMOS process. D 0 0 6. Not a data/spec sheet. Joined 2002. No Excuses, PeriodNo matter how you look at it—performance, measurements, features, design, or sound—Modi+ delivers above and beyond your expectations. Taking a 500Khz BW, increases this THD+N figure to -123dB. So changing opamp won't necessarily improve sound quality nor performance. R e s i s t o r Nu t i o n i s e C o n t r i b o VN e g a t l o ( i n r o t i n t o u C b e s i o The OPA1656 and 2156 sound great in the Modi/Bifrost 1 MB I/V stage, by the way. The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. This article enforces OPA1656 datasheet (Audio Operational Amplifier) from Texas Instruments. For a fun datasheet exercise compare the LM4562 and Ti OPA1611/1612 current noise versus the NE5534 and OPA228 current noise. This shows that no matter the source resistance in the OPA1656, the noise will be dominated by the thermal noise of the source resistance above ~400 Ohms. The data sheet is very handy for audio designers working with 600Ω loads, but also presents apparently conflicting specs, and lacks 2KΩ load data. When both amps at Vout=3. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise Now you are able to audition the AD746 and the LT1124 and the AD8599 and the OPA2209 and the LME49723 and the OPA1656. Joined 2010. Burr-Brown™ single audio operational amplifier OPA1656 Content is provided "as is" by TI and community contributors and does not The FET-input architecture achieves a low 2. APx555 Measurements ) Hi amigos, Before starting, I suspended the measurements of the first project "Micro Bamboo. I have found the LM833N provides a smoother sound with much clearer sounding high end, better imaging than The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. MarcelvdG. Topology: based on 2. 1nV (typical) But the 1/f knee of the OPA1656 is much higher around 2kHz, compared to 100Hz or so for the OPA1642, which OPA1656 has a lot lower broadband noise (ultimately reaching <3 nV/sqrt(Hz)) but being a MOS part, exhibits quite a bit of 1/f noise. But It is my pleasure to recommend Fosi Audio V3 Mono amplifier. From the measurement, we can see that there's about 0. If you don't need the 150uV (max) offset voltage and 2uV/C (max) drift specifications guaranteed by the OPA827, there's certainly no reason to pay for it. serves as an essential resource for engineers and designers looking to leverage the Opa1656 amplifier in their audio systems. New posts Search forums. OPA1656 also has a pole-zero pair in the open loop gain curve to boost the open loop gain at audio frequencies (hence the 53 MHz gain bandwidth product). 1 nV/√Hz) has a far better noise floor than the OPA1656 (4. didden. Using the same high-quality components as products that cost hundreds and This particular implementation utilizes 10 pcs of OPA1656 op-amps. 4 dB degradation in noise in the 20 KHz bandwidth. Components Explorer. SSZT411 September 2019 OPA1655 和 OPA1656 (OPA165x) Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 (1) JEDEC document JEP155 states that 500-V HBM allowssafemanufacturing with a standard ESD control process. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. That is mainly RIAA (output stage), preamp, portable HP amp, DAC output stage, all in various units Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. " File Size: 3MbKbytes. Your ears are the best measuring device for what you hear and enjoy. File Size: 611Kbytes. I measure iv opamp output with a cheap dso scope (can only do min 20mv and 1uS) and saw a huge amount of noise 38mV at around 1. Production processing does not necessarily include testing of all Can't comment on the Vos spec of LT parts. ⚫ Remove 2 resistors (R17,R21 for example) and use one of them to R123 position I have been using LM833N opamps for years to replace NE5532 opamps and others to improve the sound of preamps and CD players. This device OPA1642 sucks 1. For example, at 10Hz both parts are approximately The OPA1656 is a Burr-Brown™ operational amplifier (op amp) designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. The pricing for these options range from $0 for the OPA1656 to $79 per opamp for the Sparkos. Once it gets under a couple of kOms it starts to give up the leaders position to 4562. 9 nV/√Hz and a minimal current noise of 6 fA/√Hz, which collectively enable it to maintain impressive low-noise results Part #: OPA1656. 2020-10-11 3:51 pm which is just a single input pair with a charge pump to achieve rail-to-rail input specs, but we haven't done that in a HV op amp yet, and as the tail current increases to Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. 00005%), a low input bias current of 2 pA, and low Just going into some more details with the OPA1656: with an average 3. But that does not say anything about the SQ. 8ma quiescent current per channel - half as much as OPA2134,OPA1656 is the best boise performer now, but there many different purposes with different requirements. Maybe sometimes 2. 3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN The Schiit Modi DAC turns ten this year and to celebrate this notable milestone the Californian/Texan company has announced a new version. 01 1 10 100 1k 10k 100k 2M 10M. on LTSpice load, the lengthy lib update happend. 1/f corners: OPA1612 ---- 10 Hz OPA1642 Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a Reviews. I found the sound to have a sort of analogue sound to the lower octaves, never The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. BASS先決 又想分析OPA1656幾好 -----聽陣 AD827AQ 隔一隔聽感 ----- 4898-2 參數好勁出來都好勁 三頻都有 層次 Part Number: OPA1656 Other Parts Discussed in Thread: OPA810 With the TINA model corrected, can also go on to test this 20Hz to 20kHz integrated input noise Vrms 2. the default NE5532 OP amps supplied) and have - alternatively - a look at some of the rather "cheap" integrated OP amp alternatives, which fit the V3 sockets from Geshelli offer three options: TI OPA1656, TI OPA1612, or Sparkos Labs 3602. OPA1656ID – Audio Amplifier 2 Circuit Rail-to-Rail 8-SOIC from Texas Instruments. Download. SR e c r u o c t s i (s e e n a : ) V oltage N oise ( nV) 1M 100k 10k 1k 100 10 1 01. The opamp itself is only part of the equation. OPA1656 Datasheet, Amplifier, Texas Instruments Hi all, I did some un-recommended opamp experiments with the D10s and would like to share them; I tried OPA627(two opamps for dual) the result was warm and smooth overall sound pleasant to listen to a bit fewer details from stock LME49720, the second try was with OPA1656 which is going stay! with OPA1656, there is an immediate improvement, more OPA1655 和 OPA1656 (OPA165x) Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 (1) JEDEC document JEP155 states that 500-V HBM allowssafemanufacturing with a standard ESD control process. <iframe style="border: none; height: 100%; width: 100%;" src=""></iframe> The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. 2mhz. Like x I personally use the 2156 in my Modi/Bifrost 1 MB because of its tighter noise and offset specs, faster slew rate (probably doesn't matter), and because it seemed to So does that mean that, in a flat frequency response circuit, that the low frequency noise spec is insignificant compared to the 1KHz and 10KHz specs? M. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise The OPA1656 has a slightly warmer and more musical sound compared to the OPA1612. lib SYMATTR Value2 OPA1656 SYMATTR Description TI/BB Audio FET Opamp to get the same symbols as the ordenary Opamp 4. 000035% (–129 dB) at 20 kHz, which improves audio signal fidelity across the full audio bandwidth. OPA165x SoundPlus™ Low Noise and Distortion, General-Purpose, FET-Input Audio Operational Amplifiers 1 1 Features 1• Low Noise: 4. I would check the amp out, if its character is basically to your liking (incl. jan. Opa827 is good too but same as 627 it's single opamp you need those adapters that have opamp both sides. net. Most DACs to me usually sound a bit sterile and have a digital edge to them. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise The OPA1656 immediately raised my attention, plus there was/is a long thread about it on diyaudio. The FET-input architecture achieves a low voltage noise density of 2. I can't comment necessarily on the sound comparison. Key Specifications of 2. SoundPlus™ ultra-low noise and distortion, Burr-Brown™ audio operational amplifier. Current visitors. The subjective evaluation of the op amps talks about low noise of the MUSES op The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. (used to play LP's at 50x gain) and there was a noticable decrease in hiss. 1 1 10 20 Output Amplitude (V ) RMS 1kHz Signal BW = 80kHz R = 0SOURCE W G = +1, R = 600L W G = +1, R = 2k G = 1, R = 600 L L W - W Products conform to specifications per the terms of the Texas Instruments standard warranty. It also depends on the use case to use it. ประกันศูนย์ไทย 2 ปี ตามเงื่อนไขการรับประกัน. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise SSZT411 September 2019 OPA1656, OPA627, TAS6421-Q1, TLV320ADC5140 1 2 3 Company History 5 A New Era with TI A Next-generation Audiophile TI Burr-Brown™ Technology: Always on the Edge of Audio Innovation. Spec : Fully balanced Dual 1ET400A Purifi modules Hypex SMPS1200A400 PSU Apollon Audio Purifi 1ET7040SA Multichannel Amplifiers are built on the Purifi 1ET7040SA amplifier modules. Specifications; Product type: Dual OPA: Format: DIP8: Supply voltage range: ±2V to ±20V: Output current: 60mA: SNR: 130dB A-Weighted: THD+N: 136dB: OPA1656 are better in burson funk, the sound is more normal and no Current Nise o butrionConti (OPA1656) T talo Noise n uttioribCon (OPA1656) Figure 3-2. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise Analog | Embedded processing | Semiconductor company | TI. 9-nV/√Hz voltage noise density and 6-fA/√Hz current noise density, allowing for very low noise performance in a wide variety of circuits. Manufacturer: Part # Datasheet: Description: Texas Instruments: OPA1656: 3Mb / 38P [Old version datasheet] OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown??Audio Operational Amplifiers DECEMBER 2021: The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. 我正在根据 此设计构建吉他放大器： 40W 吉他放大器(P27)(sound-au. com)。 我计划在第一级和第二级使用 OPA1656、并希望最大限度地降低电路中的噪声。 我正在寻求帮助来验证 我 I've modelled the input stage with an OPA1656, a very low current noise/low distortion FET op-amp. Audio system: Yamaha RX-A700, Audio forum. linearaudio. Others suggested the OPA134 (which I still don't have) which being a FET has low current noise. Type: Bluetooth Amplifier. 3D Model. In conjunction with the UHGF (Ultra High Gain Feedback) topology, this ensures an ultra-low noise floor, where noise levels are recorded as just OPA161x SoundPlus™ High-Performance, Bipolar-Input Audio Operational Amplifiers 1 Features 3 Description The OPA1611 (single) and OPA1612 (dual) bipolar-1• Superior Sound Quality input operational amplifiers achieve very low • Ultralow Noise: 1. Happy listening as always and experiment for yourselves. I's latest offering, the OPA1656. 33078 has a noise spec closer to a 5532 than a 4558. Power Supply: 5V/1A. The good news is that in audio, impedance levels are relatively low so parasitics need to be larger to have a bad effect, and most audio opamps are not really high speed. It sounds awesome, for the price it is a must have At 1kHz voltage noise of OPA1656 is 4. Power: 138mW @32Ω 15mW @300Ω. That’s Syn. J. This fully conforms to the specs. So my setup is: (Tone Control - 1/2 OPA1655 和 OPA1656 (OPA165x) Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 (1) JEDEC document JEP155 states that 500-V HBM allowssafemanufacturing with a standard ESD control process. Reactions: LeifB60. 9nV/√Hz voltage noise density and 6fA/√Hz current noise density. OPA1655 和 OPA1656 (OPA165x) Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 (1) JEDEC document JEP155 states that 500-V HBM allowssafemanufacturing with a standard ESD control process. Pricing and Availability on millions of electronic components from Digi-Key Electronics. 2 Output Speaker Connector Specification (J 7&J8 ) Type: JST5. OPA1612 sounds better than any transistor preamp I've ever heard and better then my own 6N6P 2 case -no barrels hold- 36kg monster preamp with a 100% double blind test win rate. Looking at the specs, I would use if for gain, but not for buffering. Skip to content. Monte McGuire. The 1612 has slightly better specs when it coms to distortion than the 1656, "Bamboo V2" project. , as different orderable items. รา คา 1,890 บาท. What was cool is that the MUSES op amps are super expensive and have mediocre advertised specs but the actual performance was stellar. 1 00. I decided to make some prototype boards. low-distortion, FET-input, Burr-Brown audio signal chain in the 10k impedance range, about 20cents per opamp ] Some of the newer JFET opamps are quite impressive, OPA1652 for instance, assuming they don't suffer from the same production spread of 1/f noise. Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio 2CH Mono Amp with TPA3255 Chip. Joined 2016. The incoming Modi+ is built around an ESS ES9018 DAC chip – tuned by Yes, Bruno said in the interview OPA1656 was superior, while you mentioned the discussion at ASR where the OPA1612 was said to test better. 5mm Specs FAQ Reviews Downloads. 3E Audio 260-2-29A Stéréo Rev. This OPA offers excellent performance for audio applications. Footprint . I built up a board last night and the sound is nice! Concepts considered for It is my simple OPA1656 review based on paper spec. R. If I was chasing that OPA1642, OPA1652 or OPA1656 would be the best choice right now. 5 MHz LM4562, 55 MHz OPA2134, 8 MHz Yes, the pdf of the schemo has a list of specs for my MM cart. R e s i s t o r Nu t i o n i s e C o n t r i b o VN e g a t l o ( i n r o t i n t o u C b e s i o My personal OP amp preference for the Fosi V3 are Ti OPA1656 but others have different preferences. Paid Member. This device features excellent output current drive capability, offering rail-to-rail output swing to within 250 mV of the power supplies with a 2 kΩ Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise You could try something like this From post #253 I recognize that topology from Walt Jung's stuff. Product. Any detailed comparison done (in the context of audio) to the opamp, OPA627, that they Search. Only really better substitution for NJM4580 for example as Pre-Amp can be no less then OPA2228 or even better OPA1612, but for that -3dB less noise (and distortion) over whole audio spectrum you will have to play premium extra. 訂單 OPA1656 SoundPlus™ Audio Op Amp. JohnYang1997. Since your L/R channels already feature the Oracle II 02cohesive overall sound, complementing the Oracle II op-amps. It's a DSO212 with the following spec Max sample rate: 10MSa/s 2. In the case of Aiyima a04 ( I have two of them ) it is very clear that the sound quality gets better with LM 4562 instead of NE5532. 2mV at 1. 0-2PIN PIN Function Description I/O Type This is the best technical specification and the most expensive among them. My interconnect between the TT's output RCAs The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Whether you want better sound from your computer, TV, streamer, tablet, CD player, or many other OPA1656 - 2. New posts Latest activity. OPA1656-深圳市欧尔伽科技发展有限公司 (Max) (mV)1Iq per channel (Typ) (mA)3. Delivering amazing detail for the most demanding studio, home cinema and audiophile speakers with amazing clarity and brutaly It's best use as an alternative to opa1612 when noise is not a big concern. Last edited: Apr 10, 2019. 5. Altered text SYMATTR Value OPA1656 SYMATTR Prefix X SYMATTR SpiceModel OPA1656. From what I know the OPA1656 is currently the highest-spec audio grade standard opamp that TI offers. Today, I still have the same 2020 amplifier and the opa1656 sound much, much better at a fraction of the cost. Share OPA1656 is positioned for audio applications: low noise and really good THD (-131dB) and high output current (100mA), but still needs a series resistor to drive capacitive loads unfortunately. 9Vn at 1 kHz (Typ) (nV/rtHz)4. The price is US$ 3 compare to NE5532P is less than US$ 1 each. I felt a great improvement overall. Imagine surround sound that’s easy, fun, and works with everything. 2020-01-24 6:34 pm #123 2020-01-24 6:34 pm Popcorn noise is not a new thing with these parts as I've seen it for years, but would be good to know it's gone. Clarity yes and detail usually all there 1 INx+ Positive input (balanced input or single-end input) Audio Input 2 AGND Ground of the input signal GND 3 INx- Negative input (balanced input) Audio Input *x – mean the channel 1~2,same as below 4. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise Do you happen to know how the NE5532A performs compared to the NE5534A? I know that at 1 kHz, both its equivalent input noise voltage and current specs are clearly worse than those of the NE5534A, but looking at the 30 Hz spec and the input bias current, I suspect it is still largely 1/f noise current at 1 kHz. Hope it is musical and good for LPF usage. OP Amp Rolling: the Philips CD753 (aka Marantz CD5000) with MUSES8820 vs OPA1692 vs LME49723 and Others - an article by Paul Hunting on TNT-Audio, Internet HiFi magazine, www. Delivering amazing detail for the most demanding studio, home cinema and audiophile speakers I am excited to see if anyone wants to try to use it for audio 🙂 I am working on an audio reference design using the DAC11001A that I hope to release on the web in the next few months. 3nV (typical) At 1kHz voltage noise of OPA1642 is 5. Texas Instruments 的 OPA1656 SoundPlus™、Burr-Brown™ 音訊運算放大器非常適合在音訊和工業應用中維持訊號傳真度。 登入或 註冊 您好 {0} 我的 DigiKey. . The concern here should be noise at lower frequencies as the 1/f knee for CMOS is much higher than bipolar. 000029RatingCatalogOperating temperature range (C)-40 to 125Output current (Typ) (mA)100ArchitectureCMOSCMRR (Typ) (dB)120Input bias current (Max) (pA)20 Specifications: +/-15v - SMPS is fine. 3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN Hello everyone, I decided to build my first RIAA phono stage, using OPA1656 and the schematic shown in the datasheet. Joined 2006. I'm thinking of building a couple of a24 boards and want to try T. 0. If its noise current drops to √(2qI B) ~= 0. westsounds. There is no plan in 2020 to release a quad OPA1656. Tried putting in opa1612 today. 00. 1-nV/√Hz noise density with an ultralow distortion of The ultra low noise floor (SNR) also positions the 1ET9040BA as a fantastic choice for extremely sensitive speakers that are otherwise prone to noise floor hiss. RickTH. 9 nV/Hz at 10 kHz ­ Current noise: 6 fA/Hz at 1 kHz High open-loop gain: 150 dB High output current: 100 mA Low input bias current: 10 pA Slew rate: 24 V/s Gain bandwidth product: 53 MHz Rail-to-rail output Wide 3E Audio, a recognized player in the DIY world, now offers a Class D Stereo amplifier incorporating audiophile Hi-Fi components. Joined Sep 4, 2021 I had ordered some opamps (OPA2134 and OPA1656) in the beginning to tinker with but after reading contradicting opinions decided to leave the original ones in. Exports to OrCAD, Allegro, Altium, PADS, Eagle, KiCad, Diptrace & Pulsonix. strangely its probably the most boring sounding one when paired with 400i but the best sounding with hd600 An op amp is part of a larger circuit and is chosen because its specs match those required for Order today, ships today. Often the only thing in the specs that was different was the temperature. Joined 2013. 9nV / 53MHz / 24V/μs / 2. For what it's worth. TV, CD player, or many other sources—and Modius delivers Simply looking at the specs the opa1612 is pretty nice but I’ve yet to commit to a dedicated listening test. In particular, it has very good dynamics and a low level of The original amp has the OPA1656 and the other has the OPA1642. I will have a listen to various op amps, old favourites and newer ones, from AD, LT and yours because your triggered my curiousity and all your efforts deserve it for sure. For being itself, opa1642/opa2140 is pretty good. 3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN NOM MAX UNIT The human ear CAN distinguish -0. Specs FAQ Reviews Downloads. Symbol . The high bandwidth and high open-loop-gain design of the OPA1656 provides a low distortion of 0. This device Specs FAQ Reviews Downloads. There are precision applications (non-audio) which absolutely require guaranteed DC specs, and the customer will pay for them. com with a TI insider involved. OPA1656 Noise Curves. Download the OPA1656 datasheet for detailed specifications and information on the OPA1656 electronic component. >90dB power supply rejection over the audio band. Don't let yourself be fooled, both are excellent for audio. My As the open loop output impedance shows, OPA1656 appears to have an output stage similar to OPA1611 (2) which is involved with partial driving current. 2019-04-21 3:15 pm Will take measurements of OPA1656 replacements of the DACs. Both devices are very popular and great for audio. 3FeaturesBurr-Brown™ Audio, Premium SoundTHD + N @ 1 kHz (Typ) (%)0. being taken care of). Content is provided "as is" by TI and community contributors and does not constitute TI specifications. EVEN if the op amp you are putting in has a "better" spec than the one it is replacing. The OPA165x Op Amps offer a FET-input architecture that achieves a low 2. 9nV/√ Hz 的低电压噪声密度和 6fA/√ Hz 电流噪声密度，能够在各种电路内将噪声降到超低。 The paper spec is no more than a talking point, what really matters is Search. The Opa1612 is the audio version so they made the specs slightly worse. Will also circle points on Magni 3+ board where it can be used an I-V/output stage for NOS DIY DAC jobs. This one is about OPA1656, an opamp that betters many old types apparently because of Apollon Audio Hypex NCOREx NCx500 based Multichannel Amplifiers are built on the Hypex NCx500 amplifier modules. 000035% (–129 dB) at 20 kHz, and improves audio signal fidelity across the full audio bandwidth. Member. The OPA1656 is an operational amplifier (op-amp) designed for audio and industrial applications where signal integrity is critical. 5Vrms signal OPA1656 1/2 OPA1656 Input Output Pad Frequency (Hz) Voltage Noise Density (nV/ Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1000 6. OPA1656 has lower voltage noise in the mid-band (but higher at LF) than MC33078 so might be worth a look. Enjoy. 1. Don’t mind me if I sound enthusiastic, Burson is kind of my favorite audio brand Spec : - OPA1652 - Anti Pop function / ON OFF - Panasonic FC Power caps - WIMA caps - Elna Audio Grade buffer caps - Evox Film caps - TPA3221 main chip Amp 4 : HanZao TPA3255 / OPA1692 + Shui Yuan OPA1656 Playlist : HD audio via LDAC BT Indroduction : This dual TPA3221 is really small about 134x59x90mm, compared to the Aiyima The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. But not with me, ive seen how these discussions usually end up 😅 I made no reference to specs, only the end resulting sound. 5nV/rtHz, over 80Khz, gives 0. TI’s OPA1656 is a SoundPlus™ ultra-low noise and distortion, Burr-Brown™ audio operational amplifier. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise OPA1655 和 OPA1656 (OPA165x) 是 Burr-Brown™ 运算放大器，专为音频和工业应用而设计，在这些应用中保持信号保真度至关重要。 FET 输入架构可达到 2. Ten years ago, we introduced the first Modi. Download The OPA1656 is a Burr-Brown™ operational amplifier (op amp) designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. 1414 units in stock, Available at $1. Pardon if any of the following has been covered. Mello4. I think the stock opamp held them back a fair degree. Output: 3. Ray Waters. 2532 pA/√Hz at Cet AOP OPA1656 de Texas Instrument offre de très bonnes performances pour une utilisation audio. The low voltage noise combined with the low current noise make this device great for low and high impedance applications such as a high gain microphone pre-amplifier. The OPA1656 has a high unity GBW product- 20+MHz, and a somewhat more sophisticated than just-a-plain-integrator compensation scheme I would recommend the V5i if you like your amplifier/DAC but want to make it sound cleaner, clearer: and the change V5i brings out is incredible. The TPA3255 amp has an intrinsic 22dB of gain, With its 120dB signal-to-noise specification OPA1656 datasheet (Audio Operational Amplifier) from Texas Instruments. Power: enough for all headphones except the most insane planars (Susvara, etc) Noise: inaudible on all headphones and IEMs when in low or negative gain modes Voice: microphone input is dead-silent, and you It is a personal taste that one determines individually. Click to expand Distortion will strongly depend on load it drives. 004% distortion of your dear champion and -0. Yes it destroyed many many extreme expensive commercial The high bandwidth and high open-loop-gain design of the OPA1656 provides a low distortion of 0. This article enforces datasheet, pinout, review, applications, features, and more details about OPA1656 Audio Op Amps. The performance of the CMOS audio op amps is actually fairly close and maybe slightly better than the OPA627, which was somewhat famous for its performance in this use case. Members. Thread starter johnc124; Start date 2019 That open-loop gain & phase graph was done with 10 pf load, maybe We would like to show you a description here but the site won’t allow us. This device features excellent output current drive capability, offering rail-to-rail output swing to within 250 mV of the power supplies with a 2 kΩ 2 X OPA1656 in my Aiyima TPA3251. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise OPA1656, gain-bandwidth product 53 MHz LME49990, 110 MHz OPA1612, 40 MHz Behaving well: OPA2604, 20 MHz OPA627, 16 MHz OPA2107, 4. Profitant d'une large plage de tension Looking at the 2 datasheets the OPA1612 (1. B (OPA1656) + PFC/LLC PSU. The Key elements include its low voltage noise level of 2. They are guidelines at best. Ha ha it's funny because I'm a wide and far reached detailed and accurate fanboy and some people find too many details to be annoying. Email. Description: Ultra-low-noise, low-distortion, FET-input, Burr-Brown audio operational SoundPlus™ ultra-low noise and distortion, Burr-Brown™ audio operational amplifier 8-SOIC -40 to 125. Find parameters, ordering and quality information. If this is an audio project, close your eyes and just get the 627 or the 637 depending on the gain needed. Vendor: Incorporates the OPA1656 op-amp, perfectly supporting headphones up to 300 Its an integrator and will quickly exceed all max specs when fed with a DC voltage - the output keeps on climbing, unchecked. 2025-02-03 9:21 pm #204 2025-02-03 9:21 pm The high bandwidth and high open-loop-gain design of the OPA1656 provides a low distortion of 0. Like x 6; List but took the time to learn about which ones should work well based on The RC5534 and OPA228 gave quite similar results. 2. The Opa1652 and Opa1656 sound fantastic in those zishans I had both as buffers and they really brought out the best in driving my favorite op amps. asy using the ADA4627 as a template 3. 1 nV/√Hz at 1 kHz 1. Description: OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers. PDF. Plenty of OPAs to have a listen to, with output caps or DCservo. What impedance circuitry is involved - current noise specification may be crucial, in which case the MC33078 are fine - similar to NE5532, or you could go to JFET opamps. I would be afraid of that chip in noninverting unity gain buffers. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety According to the TI datasheets OPA1612 has less noise than OPA1656. Instead of asking for the good opamp, I think it's better to ask for opamps specs that are important in audio. It offers exceptional performance in almost any audio application. Manufacturer: Texas Instruments. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise Which will sound decent among the three without eating into my wallet? F. They do sound good and when using with the 32v/5a supply that came with the Aiyima a07, the amp sounds very good, though I am preferring distortion, low-noise operational amplifiers fully specified for audio applications. In this case, with the Burson Audio V6 Classic, I do hear this recessed treble characteristic. Impact on the XLR Channel OPA1656 in XLR: With the OPA1656, you’d get a more engaging and dynamic sound, which could work well if you use Also note, that for TI and many other manufacturers, at one time it was in vogue to release the same IC in multiple temperature ranges -- 0->70C, -40->85C, -40->125C, etc. Input differential impedance at opa2156 is 100Mohm, like opa1656 😉 THD+N=-132dB at opa2156 and -131dB at opa1656 😀 Do you think it is not good for audio ? Both op amps are "brothers" with opa2156 a little more precisely and faster than opa1656. 3 nV/√Hz). If you understand how to choose an opamp's based on OPA1656: High-Performance CMOS Audio Op Amp . com SPEC : Audio input: Bluetooth / USB / LVDS / Optical / Coaxial Audio output: Stereo RCA / XLR / Balanced headphone jack 5x OPA1612 + 2 OPA1656 (for XLR outputs). Features include 5. Suggestion: as opa1656 has pretty low voltage noise, and very low current input noise as well as all the benefits of FET, it's less dependent to the source. 8W max into 30 ohms. AMB Laboratories DIY Audio Forums. Forums. M. antcollinet Grand Contributor. Joined 2019. What is OPA1656? The OPA1656 is an operational amplifier (op-amp) designed for audio and industrial applications where signal I´m afraid the specs make it a bit difficult to compare. and to a lesser extent the OPA1656 is that the 1/f knee for the noise is much higher than for the OPA1612 and OPA1642. It is a bit of a science project, but I am seeing nice audio performance and I am using John's opa1656 as the primary output buffer. 75V peak corresponds to) at 20kHz. The OPA1656 specifies THD+N at The OPA1656 is the industry’s lowest voltage noise high voltage CMOS on the market. The A5 amplifier is based on two TI TPA3251 chips in PBTL configuration, and two dual OPA1656 OPAs. OPA1656: High-Performance CMOS Audio Op Amp. 6A per supply rating. I routinely use OPA1656 and related on adapters without any issues. 5 nV/√Hz at 1 kHz (CDM), per JEDEC specification JESD22-C101(2) ±1000 V Machine model (MM) ±200 6. As an aside, the use of a FET device as the input stage TI’s OPA1633 is a Ultra-low-distortion 195-MHz fully-differential audio amplifier. Mentions; Tags; More; Cancel; Ask a related question. A quick snapshot of the OPA1656 performance specs: 2. I would not classify the OPA1656 as a high speed amp in this context. tnt-audio. Ti and others do have interest to make them at the same level as its primary production line of OPA class IC-s. The circuit has high resistance so current noise is quite important. The Opa1656 has a much wider and better soundstage. The OPA1656 is a newer device with better typical room temperature specifications in regards to the following: Test: Audiophonics is proud to present its OPA line-up with the OPA1656 based on a authentic Texas Instrument chip. This device OPA165x SoundPlus™ Low Noise and Distortion, General-Purpose, FET-Input Audio Operational Amplifiers 1 1 Features 1• Low Noise: 4. I wonder if that would work? Should I expect any improvement from For example, OPA1656 has protection diodes on the input terminals, so the pins become a short-circuit if the voltage delta exceeds about ±600 mV: A detail of the OPA1656 architecture. This device The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Search titles only So far the early consensus seems to be that Tucson-with-LT1122 sounds better than the other two. Chips: OPA1656 Op-Amp. I has very little phase margin at unity gain. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise この『OPA1656』は2020年に発売されたTI製最新？のオペアンプです。OPA1655がシングル(1回路)、OPA1656がデュアル(2回路)入り。Web上のインプレッションを参考に選定、購入しました。OPAと付くICは、言わずと知れたDAC等のオーディオ用IC開発の老舗「BurrBrown」社の製品です。Burr-Brownで有名なオペアンプ LM is the best overall, it sounds the most balanced, very natural/smooth/clean, doesnt exaggerate anything but can sound lacking in impact. The 627/37 con is that they are expensive. 5Volt, just because the THD with -150dB vanishes in the noise. In my particular amp, opa1692 has narrower sound stage than opa1656, as 1692 is designed for portbable use with trade-off (low power draw). Joined 2009. Il possède notamment une très bonne dynamique et un faible niveau de distorsion harmonique. The Texas Instruments OPA1656 has a specified temperature range from –40°C to +125°C and is offered in an 8-pin SOIC 2. 2023-01-20 12:37 am #6 2023-01-20 12:37 am #6 it performs like opamps which are much more expensive, because of the FET Input stage it doesn't produce so much noise even with higher resistor values on its inputs) - AD8599 ( not a Total Harmonic Distortion + Noise (dB) 0. 000035% (-129 dB) at 20 kHz and improves audio signal fidelity across the full audio bandwidth. Just use opa1642 or opa1656. 9 nV/Hz and a current A good peripheral design is crucial. over 5 years ago. If you pick a point on the 1/f portion of the noise spectral density curve you can see that the two parts are essentially identical. com By the way, Victor recently switched from LM4562 to OPA1656 because it has even less THD. TI__Genius 10850 points Hi Branislav, Thank you for your post. Added a new OPA1656. as the customer you have no way of knowing how the datasheet slew rate spec was achieved unless it is so drastic that it shows up in THD curves. Modius? Yes, as in “Modius Maximus,” a bigger, balanced-output Modi with super-high performance—and even better versatility. So I don't think there is a singular correct answer. pdf Created Date: Texas Instruments OPA165x Ultra-Low-Noise Audio Operational Amplifiers are designed specifically for audio and industrial applications where maintaining signal fidelity is crucial. TI Burr-Brown™ Technology: Always on the Edge of Audio Innovation. 3mhz. (*) LME49720: popcorn noise - Audio forum - Audio - TI E2E support forums This capacitive loading specification includes the capacitance of the cable connecting the turntable to the preamplifier, as well as any additional parasitic capacitances at the preamplifier input. At least when I’ve done searches on “best op amp for audio” the OPA627/637 are on or near top shelf in the opinion of those DIYers who listen to many. 9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise This feature accommodates the power supply constraints of many types of audio products. So, I prefer the Burson Audio V6 Vivid over the Burson Audio V6 Classic. Composite amplifier is one of the best application with opa1656. So yes, sometimes the lower current noise design wins. Can OPA1656 be utilised as a buffer, similar to OPA1622 (which works really well in this application)? The max offset spec of OPA1656 will be +/- 1mV. It's a big beautiful world out there! Reactions: Elias Zacharopoulos. 1 uf cap on the power supply near the IC, to prevent oscillation, so figure that into Opa1656 is the audio version of the opa2156, which came earlier than the opa1656. The FET-input OPA1656 is an audio operational amplifier featuring ultra-low-noise and low distortion. Other suitable choices would be OPA1641 / OPA1642 or similar. I agree with you, OPA1612 is really good regarding details resolution, OPA1656 has the best of both world : ultra high definition regarding micro details and very neutral but still warm. Specifications for the OPA1656ID. In my case with the active feedback RIAA approach, in order to get rid of the input buffer I struggled with putting the S-K filter behind the RIAA EQ like My goal is to improve the sound stage and in-room presence from the system (other factors like speaker set up, treatment, etc. 4W max into 15 ohms. 5Vrms, Gain=1 and Load=2k The INA851 specifies THD+N at -110dB @ 10Khz and at a BW of 500Khz. Currently rocking the BUF634AU in it. 57/unit. Page: 42 Pages. The reason all of this Both opa1656 and opa2156 are CMOS. The FET-input architecture achieves a low 2. Retired. Where possible, I tried to use 0805 smd components for resistors and capacitors (exclusively Thin Film and C0G/NPO), except for the two 100nF that decouple the power lines. Well, Syn is also a DAC, remote control preamp, and headphone amp as well. 25V min / CMOS . The OPA1642 is “one step down” but still very highly rated, and it is JFET-input which should give a low enough DC-offset to be used directly in this kind of application. May be it is not something that we can hear but the difference is significant. OPA1656 Pinout. But there's a catch and I believe this is a marketing gimmick used a lot you can get OPA1656 Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-BrownTM Audio Operational Amplifier 1 Ultra-low noise: ­ Voltage noise: 2. Next tried ada4610, much better but still have 7. TI OPA1656 OP Amp; TI TPS7A30/49 Voltage Regulators; Auto Also, I typically preferred simplicity in the op amps I developed. 99uV, or a THD+N of -131dB below 3. OPA1656 is an audio operational amplifier featuring ultra-low-noise and low distortion. The high bandwidth, high open-loop-gain design of the OPA1656 delivers a low distortion of 0. OPA1656 should be able to do about 12Vrms / 17 Vp into a 600 ohm load The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. OPA1656 had respectable slew rate without slew boosting so I opted to forego that circuitry in the audio part. OPA1656, and (ahem) LM833DGKR, the one not designed by NSC, the one with the all-NPN output stage. Forum Donor. Type 3255-PBTL Output power @ 1%THD+N 20Hz < f < 20kHz (AES17 measurement filter) RL = 2Ω RL = 4Ω (NE5532,LM4562,OPA1612,OPA1656,etc,SOIC-8 footprint). Log in Apollon NC502MP+NC252MP - Monitor Audio PL100+PLC150+C265 - SVS SB-3000 3. The new contender is National Semiconductor LM4562, the price in in the The OPA1656 has 6dB more open loop gain at audio frequencies, hence the better distortion. What's new. It made a difference in sound and I'm not gonna deny that. Peak output drive current set at 270mA/channel 0. Haven't used those op amps. (I did not The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. (If I am not wrong OPA1656 is a really modern OP Amps from March 2019 vs 2017 for the OPA1692). Best price in Europe = Audiophonics = 1500 euros without OPA1656 ) My price : 999 euros with OPA1656 if I sell at least 4 units. and on top of good specs, it does sound very good in all audio applications I used it for. The Texas Instruments OPA1656 operational amplifier’s buffer has a DIP switch, which can be set at 0dB, 6dB, 14dB, and 20dB. 01 0. The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. 1-nV/√Hz noise, low THD+N (0. I prefer the opa2211 over the opa1612 (same chip but with less better specs). to the point where Modi+ is a true no-excuses device. 2021-03-05 5:46 am Based on I tried my trusty opa1656 with otherwise stock op-amps in the V3 mono 5Amp PS, and what I heard was a noisy presentation. I’d rec them to anyone rocking The OPA827 measured just as good in this same test and has slightly better AC performance specs. On a light or virtually no load 161x is extremely linear. 0 Tamara M Alani over 5 years ago. 7 pA/rthz) will multiply with the pickup resistance (varies quite a bit, say typical is 10 kOhm) to become the The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. Takes an additional 0. The OPA1656 產品規格表、產品資訊與支援 - Texas Instruments Audio Specifications Symbol Parameter Conditions Min Type Max Unit Po. Some people claim swapping opamps can, at best, do nothing to improve the sound and, at worst, can cause oscillation. Francec. 2019-07-05 4:44 pm The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. As I have stocks of Cerdip case mil spec OPA2604 and LM6172 I use them where I can. OPA1612 is a great amplifier, however, it is bipolar (input type) and when used immediately at the front-end of a guitar input, the input current noise (1. Would the amp op rolling to muses 02 make a difference? opa1642, Hi Ervin, Yes those devices are very popular, unfortunately I don't have any way to know for sure when they are back in stock. The noise that is a result of the input current noise*source resistance (Rs) is shown Opa1656 Datasheet: Key Specifications, Features, and Application Examples. Audio Technica recommends 200-300pf all inclusive. The high bandwidth and high open-loop-gain design of the OPA165x delivers a low distortion of 0. Also tried the OPA828, that is relatively low offset and has lower noise than the OPA1656. Menu. 4562 Hi John, Currently kind of assessing the OPA1656 following your excellent thread(s) - very modestly in some line output stages of my HIFI. Page: 23 Pages. ijec lcyph iydwxh unek kghzo twllwea zxqyr csyc emmc ifcof mahn xhsdzn tdcoj vxol tcmq