6922 preamp schematic. 2 MC-2 6922 MC Preamp SRPP (op amp .

6922 preamp schematic. The 6N1P has about 2X the plate resistance of the 6922/ECC88/6DJ8. 6DJ8 Tube Phono and Line Preamplifier Schematic Feb 3, 2012 · ECC88=E88CC=E188CC=CCa=6DJ8=6922=6H23П In terms of electrical characteristics, these tubes are nearly almost the same. Jun 30, 2014 · FWIW: got thinking a bit about the 6922 circuit--he's pushing the tube pretty hard in the cathode follower (second stage) and it isn't necessary. In the topmost circuit we see the approach of using two gain stages with one complete RIAA equalization network in between. We are always adding more as we find them so check back often. One 6922 or 12AX7 or 6N1P per channel is all that is needed. This is one of many possible variations for a Symmetrical SRPP Preamplifier based around the 6DJ8 / ECC88 family of tubes. Post a reply. Mar 24, 2018 · No, I'm not building it. A 5. May 4, 2012 · Tubes take time to warm up so you need to consider if you need a 'mute' relay or something between the pre-amp and the amplifier to avoid a turn-on 'thump' from the speakers or just remember to turn on the pre-amp first. Cost and Tube (6922/ECC88/6DJ8) Phono / Turntable Preamp A short video of a Tube Modified. So the audio circuit ended up being very similar to what's being discussed here. They are all over the place! Look at Morgan Jones BETA FOLLOWER in his book VALVE AMPLIFIERS. There is no 300Ohm resistor separating the output of the regulator and the 6922 anodes. Information & Articles. 2 MC-2 6922 MC Preamp SRPP (op amp Nov 30, 2016 · In 1995, the UK magazine hi-fi world published an article about their KLPP1 preamplifier kit, which was designed by Andy Grove (later going on to audio note UK), and used four Sovtek 6922 tubes. Moderator: kabubi. The preamp circuit consists of various components such as resistors, capacitors, tubes, transformers, and connectors. As a result, in terms of distortion and output impedance and PSRR, the following circuit works at least a magnitude better than the equivalent SRPP or grounded-cathode amplifier. 4 mA to at least 6mA, and the trend continues to flatten to 15 mA. The 5670 is used as the voltage amp/driver. Tim Paravicini (EAR) uses the 6922 in the 88PB Phono preamp and is used in the Manley Steelhead. Feb 6, 2016 · Stuart Yaniger wrote a great article for audioXpress in February 2009, The ImPasse Preamplifier, describing a tube preamp to drive a pair of Nelson Pass’ First Watt F4’s (or other low-to-unity-gain power amplifiers) in balanced mono. mpholland 6922 preamp tubes. Nov 8, 2014 · If you have a schematic, that is even better. Aug 22, 2021. Whether this is a good idea or not depends upon the circuit design and what the designer intended. OK this schematic came from here: DIY 6922 / E88CC Tube preamp On that page you'll see his loadline for the Nov 14, 2012 · This amplifier uses the "EL Cheapo" topography although, naturally, the implementation is quite different. On the FVP5A schematic (see above), Allen cryptically suggests the 5687, among other alternatives to the 6922, in this position. Vox Amp Schematics to assist you with your amplifier repairs and modifications. But others have also pointed out that there is nothing really to gain from that, except shortened tube life. The 6922 became so popular for instrument use, that large military contracts were put out for it both in Europe where it was called the CV2492 and CV2493 and in the USA where it was usually marked as JAN Jul 19, 2023 · The chassis is now 3U high unit. Bypass cap grounding resistor: R5 47K. Thread starter mahoule; Aug 11, 2017 · Preamp 6922 tube help . Paraphrasing the Aikido manual, resistor R9 & R10 form the part of the circuit designed to eliminate power supply noise from the output. Although the tutorials are using 6922 calculations, using the same formulas may assist you in designing an amplifier based on other triodes. 6 W Bulb temperature (surface hottest point) 170°C Cathode Current 20 mA TAD 6922/E88CC Premium Select High-Mu Twin Triode The TAD™ 6922/E88CC: is the High-End-Version of the ECC88 or 6DJ8. Aug 22, 2012 · Hi I do not know anything about a mu follower to me it looks like a classical totem-pole output amplifier, why give it a new name. The 12 AX7 was reportedly specifically made for Jul 2, 2012 · After finished my simple 12AX7 tube preamp, I decided to try other medium mu tubes, including the 12AU7 and also this 6922. 95 . For the optional MM phono preamp, also using the 6922 tube, B+ and filament supplies too are regulated solid state DC. The line amplifier uses three 5687s with a mu of 12; the 5687 is equivalent to a paralleled Aug 29, 2008 · Also, the same PCB wiring (almost) is used for my 12ax7, 12au7 and this 6922 preamp, just change the resistors and I can try new tubes. Electro-Harmonix 6922EH Preamp Vacuum Tube (5 Reviews) USD $‎29. etc. V3 and V4. The following value need to be adjusted: Cathode biasing resistor: R4 350R. Yaniger’s preamp is truly an elegant design with very, very low distortion, using a 6SN7 to drive a 6922 in balanced mode. Dec 13, 2023 · Every circuit has been updated from the Janis, resulting in an even better all tube high end phono preamp. Mar 12, 2018 · In the 1/98 issue of Glass Audio, I wrote about a hybrid tube/MOSFET line amp, which, because of its musical sound, became a very popular amplifier (“Low-Voltage Tube/MOSFET Line Amp"). If grounded-cathode amplifiers are used, a plate resistor and a bypassed cathode resistor, are all that is missing. Apr 7, 2018 · 6DJ8 and 2A3 tubes. amplifier circuit can be used: the SRPP, the cascode, the grounded-grid amplifier (with some tweaking), and the common-cathode amplifier. Dec 8, 2008 · This preamplifier should be built with good shielding and mechanical isolation between the preamp circuitry and the power supply for optimal performance. In other words, the PSU name/schematic is nowhere to be found, as well as the place to apply the 6/12v for the tube from the power supply. This means (and it agrees with the schematic) that the 6922 sees 220V B+ and the 6SN7 sees 190V. Dec 1, 2014 · There were a few others preamps I've heard that use this tube and I didn't care for them as much so, as usual, a lot depends on the circuit it's used in. 1. Each. It uses a cascode input stage, followed by a passive RIAA filter, another gain stage, the volume control, and finally a single triode anode follower 6922 | E88CC Tubes; 6AQ8 | ECC85 Tubes; 6C4 | M8080 Tubes; Crate VC3112 Preamp Schematic Crate VC50 Schematic. The phono amplifier has an output voltage of 0. Jun 22, 2007 · 6DJ8 / ECC88 SRPP Tube Preamplifier Schematic. I used the old Handmade Electronics RCA RIAA PCB, but took the output right off the second 12AX7 and direct coupled that to a 12AT7 cathode follower. The phono section contains two 6N1Ps and one 6922, 33 mu triodes. Oct 13, 2006 · Therefore, in deference to you, my hurried reader, let me push forward from my mountain of words a few nuggets for your big toe's perusal. Aug 23, 2020 · I built a phono preamp for my brother, something like 25 years ago. This appears to be the hallmark of the Aikido circuit - low noise. The regulated DC power supplies have also been upgraded. Javascript is disabled on your browser. The circuits consist of a combination ultra low noise LSK380 JFET (dual LSK170) and tube cascode input stage with an Aikido-style output buffer. This is a bare PCB of a tube preamplifier with the gain section reference to MFA reference. My favorite preamp is my CJ ART (5 6922's per channel) but the ACT is real close. I haven't heard a 6922 based preamp I didn't at least like if not love the sound. Do not give up. . Siemens was probably the more linear tube, the Tele sounded more 3d in the mids. For the 6DJ8/6922/ECC88/E88CC, mu is constant within 20% from 0. Mar 31, 2015 · The Best Sounding CCa=6922 ever made TOP 5:-----1) CCa Siemens & Halske 1950's "U" getter halo and 1960's "O" getter halo "Rarest and most sought after CCa, has "gray shield" between plates, Most realistic sounding holographic soundstage, pure seductive sonic joy, complex symphonic images emerge effortlessly" 2) CCa Telefunken West Germany 1960's "excellent neutral holographic soundstage, vast Feb 19, 2019 · Supports simple circuit simulation For students, teachers, creators Ongoing. One an absolute best ever, and the other the practical best ever. May 15, 2013 · I would like to build a line stage preamp using a pair of 6922's and as few parts as possible. 5Vpk of input signal. 6VDC operation for tube heaters, and in the centre is a high voltage (B+) supply capable of delivering up to 300VDC depending on your requirements. The EL34 There is a schematic for preamp input stage at bottom of this page at Fig 3. MFA Reference was well-regardless as an preamplifier that has massive soundstage and rich of low-level musical information. And if you do, then the tube has a defect. a. The improved PSRR advantage is important, for it greatly unburdens the power-supply design and it helps prevent the signal from recirculating through the power supply Jun 13, 2019 · Looking back, it turns out the 88K resistor mentioned earlier in the thread is also one that varies in value. Here we've listed our collection of hifi amplifier schematics. No preamp is used as this would compromise the sound considerably. There are LED’s, NE2H neon AF Power Amplifier Maximum ratings DC plate voltage 300 V Positive DC Grid Voltage 0 V Negative DC Grid Voltage -100 V Plate dissipation 1. ALLEN BRADLEY 22 OHM 1/2 WATT TUBE AMPLIFIER Dec 3, 2008 · I have attached a schematic of my latest preamp design. Jan 10, 2019 · The first two have an amplification factor of 20 or less, while the 6922 has a gain of 33. Tube line up for each channel is 6DJ8, 6BL7, 4 x EL34. Here is the SCHEMATIC Dynaco Amp Schematics to assist you with your amplifier repairs and modifications. Dec 10, 2021 · All, I'm going to start building RJM's 6dj8 phono preamp soon. Feb 10, 2020 · So I've been looking into building a tube preamp and came across this website: DIY 6922 / E88CC Tube preamp The schematics are there, but not fully complete. OK this schematic came from here: DIY 6922 / E88CC Tube preamp On that page you'll see his loadline for the 6922: Dec 8, 2008 · This preamplifier should be built with good shielding and mechanical isolation between the preamp circuitry and the power supply for optimal performance. Due to the 80mA constant-current source, the maximum symmetrical output is a tad over 4Vpk (the signal source will provide its own 13mA of peak current swing. I'm a big 6922 fan also. I've built the VSPS phono stage and the Wyn Palmer phono stage ( like both a lot!), but those had build guides and circuit boards. Don't use 12AX7s or 6922's), it begs the question what would be the best way to build a phono preamp? Maybe even two of them. For a single ended preamplifier, like the one you started with, this link may be useful: DIY 12AU7 Tube preamp HiFi Amp Schematics. In this article we use PSPICE to explore some of the properties of a 6922/300b varaint of Randall-2 amplifier, a design based on Jack Elliano Direct Reactance Drive (a. Other circuits that could be used are the constant-current-draw amplifier, the plate follower, and the two tube feedback pair. Coolhandjjl; Aug 20, 2021; Tube Audio; Replies 7 Views 418. This circuit offers no gain; in fact, its gain is 0. Acrosound Schematics Dynaco Schematics Jun 14, 2012 · oh oh, I've seen schematics like this before, and he's driving the 6922 too hard: taking it over its dissipation-wattage rating. For the serious and not so serious in audio: DoItYourself and Tubes (SET, PP, Vintage). AUDIO NOTE M3 PHONO VALVE PREAMPLIFIER (K) in Sound & Vision, Home Original Audio Research SP 8 Preamplifier Aug 18, 2008 · The photo of the European version looks different. 1kOhm resistor separates the 6922 anode rail from the 6SN7 anode rail. The 6922 / 6DJ8 tube type is equivalent to the European ECC88 / E88CC tube and can be used in any 6922, 6DJ8 or ECC88 circuit. When you want to know the difference, look at the pics in the attachement. I have done some tube swapping in a preamp between Sovtek 6922, older RCA 6DJ8, NOS Philips JAN 6922, and Amperex 7308. Genalex - Gold Lion E88CC / 6922 Preamp Vacuum Tube (8 Reviews) USD $‎69. The design is almost the same as the 12AX7 preamp, it is a single gain stage triode tube with cathode follower. This is my second attempt at creating a circuit like this Jul 10, 2019 · The preamp is a little unique in that it features switches so that you can use either 6-volt or 5-volt rectifiers, as well as either 6 volt or 12 volt 9-pin tubes (specifically, it mentions 6922 and 12AU7, along with 12SN7 and 6SN7 via adapters). To view this site, you must enable JavaScript or upgrade to a JavaScript-capable browser. I selected the 6DJ8 for its linearity and good operation at a 35–40-V anode voltage. 3, 12, or 12. k. However, learning as much as I have from the other thread (ie. Hi, this is my first post on the board. Learn about the differences between 6922 and ECC82, heater voltages, cathode bias resistors and other topics. Any help is greatly appreciated. changing the load R and the cathode R to safer values (lowering the loadline so the current is around 5ma) would be much easier on the tube but you would have to elevate the heater supply because the cathode will be floating much higher to the point McIntosh Amp Schematics to assist you with your amplifier repairs and modifications. Schematic and parts Randall-2 is a DRD Ultrapath topology that uses 6an4 for the driver stage and 300B as the power tube. As previously stated, your mileage may vary when using a 6N1P in a circuit that was designed for a 6922/ECC88/6DJ8. Preamp Tube Gain Factor; May 4, 2012 · The 6DJ8/6922/7308 is a hard tube to find that the two sides are well matched. John Brosky talks enthusiastically about using the 5687 as an upgrade to the 6922 in his "Aikido" preamplifier circuit. Do you have a personal favorite set of 6DJ8’s, 6922’s and 2A3’s? Bring ‘em on! The multifunction bias meter, unlike a TV-type tube tester, measures the tubes in-circuit, at the actual voltages and currents of the working circuit, so you can be confident all tubes are operating at the exact optimum parameters. We provide schematic to buyers by EMAIL. Feb 10, 2020 · A forum thread where users share and discuss a DIY tube preamp schematic with 6922/E88CC tubes. Each board consists of two channel thus one board can be used for stereo application. My goal was to design a low noise and accurate preamplifier. I have a few questions and was hoping those with more Feb 18, 2018 · The 6N1P only has about 1/2 the transconductance of the 6922/ECC88/6DJ8. For this article, we . 2. >>>CLICK HERE<<< Lite Audio LS26 tube Preamp CAT SL-1 circuit valves preamplifier Finally, tube 6DJ8 output, Jul 15, 2015 · This control unit design features high-perveance tubes in the phono and in the line amplifier. Jan 30, 2023 · Any recommendations for in-production 6922 tube that sounds extended, lush, quiet? I’m going to place them into an Aikido Line Stage Preamp I’m building with high-end components like Duelund Cu coupling caps and tube rectification. Sep 6, 2015 · Tube (6922/ECC88/6DJ8) Phono / Turntable Preamp A short video of a Tube where did. I think Jun 2, 2014 · The input stage is based on a 6DJ8/ECC88 dual-triode tube in a differential-amplifier configuration. Liked the 7308 best, and that's what I have in there now, but the differences are subtle. My local retailer, whose opinion I value, strongly believes that 12AX7 tube is superior, which is used in the Aesthetix IO and in the less expensive EAR phono preamp, 834 P. High frequency twin triode preamplifier tube used in studio and hi-fi equipment. The 6DJ8 is a miniature 9-pin medium gain dual triode vacuum tube. Comparing the data sheets for the two valves did make me wonder whether the 5687 might indeed be Quad Amp Schematics to assist you with your amplifier repairs and modifications. Parallel Tubes The usual disadvantage of using many tubes Jun 22, 2012 · and he's driving the 6922 too hard: taking it over its dissipation-wattage rating. Modified Audionote M7 vacuum tube phono preamplifier / 6072 6N30P-DR a Zenith 9F25 chassis (receiver and amplifier) with out the benefit of a schematic. May 31, 2010 · feels the 6922 is superior. All are available for free download. The SRPP circuit has also been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode Follower. Please put a schematic in this thread of the amp you are building that calls out a 6922. I have over 3000 (yes three thousand) of these tubes :bigeyes: And the Nov 3, 2021 · Using the same tubes as an input stage for an amplifier is made much more complex, with more details to pay attention to whenever the input stage is: an SRPP, Mu Follower, or a cascode stage for a single ended amplifier; Or a cathode coupled phase splitter for a push pull amplifier. DIY amateurs wished to use it in many different applications, such as CD buffer, I/V converter, power amplifier, and headphone amplifier. 68 V RMS with an input voltage of 3 mV/1 kHz. If you need a vintage hifi amp schematic for your amp repair that is not listed here, contact us and we'll try to locate it. On each side is a separate low voltage supply which can be configured at 6. Mar 15, 2015 · No one has mentioned the 7308 tube, which is a direct replacement for the 6DJ8 / 6922. There is more information available about tube power supplies, in the Power Supply Design for Vacuum Tube Amplifiers article. Mar 26, 2022 · I'm going to build a preamp using 6922 dual triode tube. Just saying. Designing 6922 Cathode Follower. These tutorials will provide some guidelines for designing a high quality tube amplifier based on 6922 tubes. It is built on a Scott 299B chassis and transformer set. perfect example of Canary Audio¹s The preamp circuit features the use of two 6922 and one 6FQ7 tubes for a low noise. I took some idea from other circuits, but some of the value doesn't look correct. I would like a tube preamp, and use solid state for the rest. This will be my first point-to-point amp. ) Sep 6, 2004 · I need a schematic for preamp microphone and line with tube 6dj8 6922 ecc88. 67, which means that to get 1Vpk of output you must feed the circuit 1. I based it on the 6H30PI for it's linearity, high transconductance (for low noise) and medium mu (for a reasonable gain). than you mahoule :?: Forums. Most makers continued to produce both the original 6dj8 and the improved 6922 in parallel through the 1960s and into the 1970s. I saw this circuit first in about 1955 as an application of the new output power tube EL86 to drive an 800 Ohm loudspeaker manufactured by Philips in Holland without an output matching transformer. All other things being equal, in a feedback circuit the 5687 or 12AU7 will have less feedback and thus higher harmonic distortion than a 6922. DRD) and Ultrapath ideas. 6DJ8 Tube Phono and Line Preamplifier Schematic Jun 13, 2019 · The PS-21 is really three power supplies on one board. Does anyone know where i can get a schematic or kit (very cheap) for 6922 / 6dj8 tube? The reason i'm asking is. STD MC-2 6922 MC Preamp SRPP (op amp buffer) Rev. The first is that making a White cathode follower circuit optimal requires using a plate resistor equal to the inverse of the triode's transconductance, which is good as true with high-rp triodes and low-impedance loads, but with low-mu triode, such as the schematic 6922 preamp. When assembling the circuit for a Hifi tube preamp, it is important to follow the schematic diagram carefully to ensure proper connections and functionality. B+ as well as filament supplies are all regulated solid state DC, for the main preamp each channel has its own B+ and filament supply. 10 posts • Page 1 of 1. I suspect it was the character of the circuit. For a simple audio amplifier you won't notice any difference between those tubes. preamp mic 6dj8 (6922) ecc88. whaormf zpbzwb awz gwacuo rbxeriwb eogj fnva ttuzl lsn hqlz