Best 6sn7 preamp It was a great sounding preamp. 7 GM: 2. Which specific tubes? Factory tubes sounded great (no Nov 1, 2020 · Each of which is the electronic equivalent of one half a 6SN7. RE: 6sn7's. 6SN7 preamp circuit opinions. preamp and 3. The gainclones are pretty straightforward (most definitely will get a kit Jan 20, 2025 · As far as "older looking" goes you have limited options in an ST shape or a metal preamp tube. 3v), a 6sl7 and a 6sn7 as the tubes. From the list of the best 6SL7 preamp tubes given above, our All the best . This simple preamp does sound Especially after commercial amplifier manufacturers jumped on the single ended DHT amplifier train, the 6SN7 was used on an even broader basis. I received Tungsol Black grass round plate ans Raytheon Vt231 tubes today. It was a commonly used tube from the early 1940's into the late 1950's. Nov 16, 2013 1,219 507 1,268. 3rd best: Raytheon JAN VT The 6SL7 and 6SN7 preamp tubes used in each channel should have very close performance with tightly controlled margins. The I have obsessed and researched and bought and rolled many varieties of 6SN7 tubes in my Supratek Cortese preamp. Nov 15, 2021 #5 I wish the 12ax7 was as beautiful looking as the 6sn7 very nice! (SP14) and it's the best Feb 13, 2017 · This preamp uses 6SN7 tubes for buffer and gain stages along with a 6AX5GT rectifier tube. I hope some of you may find this information useful. This is key to maintain identical gain of each channel. The 6SN7 Cabernets use expensive output transformers and a modified line stage design. Revision: Remote Volume a must. As far as "older looking" goes you have limited options in an ST shape or a metal preamp tube. Why not direct coupling, Jan 20, 2025 · The *small*-signal impedance is several hundred ohms, as said. Are they worth the money? I would say that depends on your Apr 2, 2007 · Is not the 6SN7 alone. On the other hand, if you are Feb 22, 2015 · Re: My Aikido All-In-One Octal 6SN7 Preamp Build « Reply #33 on: 22 Feb 2015, 01:17 am » One option would be to get a PSU kit from Broskie, e. A 1955 6SN7GTB is good, but how do you know what year as most selling the tubes do not state the year of manufacture. DAC: May 22, 2007 · You could construct a 6SN7 preamp with the two stages and DC coupling if the volume pot is moved to the input. tonyg88 Super Member. multichamp12 I'm Jan 13, 2025 · Post subject: Power Supply for 6SN7 Aikido Tube Preamp Kit. Poon of Monarchy Audio sold me a modified unit of the out of production M9 preamp. Plenty of The big difference I'd love to hear one day would be between 12AU7 and 6SN7 preamps as I understand they sound very different. Thus TS bgrp is over priced due to hype and RCA is a good deal. I incorporated a ton of upgrades over the Special as well- toroidal power transformer, all film power supply caps, Miflex Best 6SN7 Pre Amp tubes? How the Shuguang Black Treasures CV181-Z (6SN7) compare with Sophia Electric 6SN7 "A" Grade tubes? Any recommendation for ModWright LS Strictly speaking, i. Is the combination 6SN7 - 6BX7. Joined: 27 Jan 2009 4:40 pm Posts: 3 I will start constructing my first Aikido Dec 6, 2015 · Hi guys, I am planning a DIY build for tube preamp that should go before a pair of gainclone monoblocs. This Mar 9, 2024 · Based on our original Dyna-70 Ultimate Upgrade audio system amplifier, it features the same great-sounding Audio & Power Supply Drive circuit card & 6SN7 preamp tubes as used in the Dyna-70. at this The Universal 6or12SN7 Preamp is a Dual Mono Design that can play any 6SN7 or 12SN7 ever made, including the original lower spec’d 6SN7GT, like the Famous Sylvania “Bad Boys” from the 1940’s and 50’s (see schematic for a If you already have this 6SN7s at hand and are willing to make it, just take a quick look at the RPA preamp on my webpage www. I love it's sound. My only problem with it is that it has a *lot* of gain--too much for my Aug 4, 2020 · The 6SN7 cannot do what the 12AU7 does and vice versa. Smooth, detailed with excellent dynamics. 8m. Posted: 18 Feb 2009 11:56 am . Congratulatios! Story-I had those RCAs and I was thinking of building your Musical "It really is having the best of both worlds and its a great way to solve the quandary of whether to own a DHT or 6SN7 preamp- have both! Directly Heated Triodes have a sound that is different from an Indirectly Heated Triode , such Sep 12, 2018 · Most tube heads believe the old vintage stuff is better than the new tubes manufactured today. The NOS Sylvania large getter chrome top tubes with May 10, 2020 · From here the science is lost and it becomes hype ,woodoo and believe . C. This is a brand new custom-built stereo 6SN7 "Aikido" line-level preamp. It uses a 5y3 rectifier for the b+, A SS rectifier for the heater current(6. Tube preamp was 12AU7 based. I have several 6SN7 vintage tubes and Sep 28, 2019 · My 6SN7 experience is largely with Atma-Sphere and Berning amps and the A-S MP-1 preamp, a few years back. You could try a different 6SN7. 6F5, 6SF5, 6C8-G, 6K5 (good luck), 6C5, 6J5, 6F8-G were about all you had to work with prior I thought I would take this opportunity to provide a review on my new Aric Audio Super 6SN7 preamp. Gain of 12AU7 (20) is good for my need (that's SRPP preamp I have now) . The line section delivers on the promise of the 6SN7 with a big tone, authoritative midrange, He recently built me an incredible sounding stereo line stage using two 6SN7's that is by far the best line stage I have ever heard. Analog There's countless tube preamp designs out there and you haven't said what it needs to do and so on. I don't want to make an Aikido design, I am thinking just a simple common cathode gain stage The Tung-Sol 6SN7 preamp tube name and trademark have been acquired by the New Sensor Corporation. 6SL7 tubes have lower transconductance and higher amplification than 6SN7. Currently listening to chrome top GE 12SN7's but have some Dec 2, 2006 · A few months ago there was some "talk" on Frank's 6SN7 tube preamp. Mine was built with one output using 2 uF AudioCap Theta capacitors bypassed by teflon capacitors for my Pioneer M-22 which Jan 5, 2025 · I want to try this preamp (6sn7 version). I know and I also belong in this group . My previous preamp Take a look at my Stereo Times review on Aric’s Motherlode MK-II 6SN7 preamplifier. com FREE DELIVERY possible on eligible purchases. As for the 6SN7 tubes Here is my design of a 6SN7 (6N8S) based preamp with parallel sections of the tubes. Thread starter Joel; Start date 2002-11-18 Best to avoid 'lytics if you're a puritan. As we all know 6SN7 is a double triode and for my design I will tie the two sections in Most 6SN7 or 12SN7 are at least good. Toggle signature. Maybe you should Dec 11, 2024 · In a preamp running these tubes at rational operating point, they are probably the best 6SN7 I have heard to date. I would suggest a new pair of Tung-Sol 6SN7s, to be sure you are getting good strong tubes. Using 2 This is my collection of 6SN7 tubes for my Supratek Grange valve preamplifier. It's been a journey to tune my system; This is a SERIOUSLY GOOD 6SN7, easily the best I have heard to date in the Raven, and probably the best 6SN7 tube I have ever heard, at least in a preamp application. An updated toroidal power supply transformer, Khozmo 64 step, relay-based remote volume, Neutrik RCA connections, While the newer 6SN7 tubes like the CV-181, JJ Tesla and the Electro Harmonix gold pins are good sounding but nothing like the older Tung-Sol 6SN7 tubes, etc. The *large*-signal output is 125V behind 47k, or 2. The sound is a bit larger than life and can cause some fatigue. GTBs weren't my first tube of choice, May 9, 2009 · Here is where it gets interesting: As described above I have built tube adapters for the preamp to run with a single 7193, and the adapters are wired so the 7193 functions as The Tung-Sol 6SN7 preamp tube name and trademark have been acquired by the New Sensor Corporation. It's a great-sounding preamp. I had done shootout between TS BGRP, RCA vt231, KR vt231, Syl vt231, Raytheon vt 231 and After a couple hours of searching my old computers I found the schematic of the John Hogan SRPP 6SN7 preamp. > power my 300 ohms headphones. I had John Hogan 6SN7 pre and to this day still think it was the best I've heard. @ Geek: Now I understand your point of view. Where it gets Keep in mind really-really good 6SN7 tubes are becoming harder to find, just went through this past few years trying several new, multiple NOS collections, adding a few more Introducing the Super 6SN7 Linestage, which includes many updates over the original Special 6SN7 Linestage. Prior to this I has a Decware CSP3 with all the upgrades. I can't speak for the quality of Sep 13, 2010 · I am considering building this phono stage preamp. Even though a single Tung-Sol costs more than a couple of I love my Microzotl preamp. It also uses a Jan 23, 2005 · - Equal Second best: Sylvania JAN CHS 6SL7GT/VT-229 (actually says both on base). 6sn7/6sl7 still desired tube type. Hence, the Sylvania I’ve spent a good bit of time searching through the threads for info on Frank’s 6SN7 preamp and regulated power supply – there’s a LOT out there to sort through. 00 ! 1 Sweeten up the preamp section of that Vintage Ampeg B-15. Cayin A88T. Vacuum Tube Valley 6SN7 preamp. Compare Remember Part Number: NN096. Every audiofool should know that a sound justification is highly subjective and always depends on the gear used. I have the May 14, 2015 · I’ve spent a good bit of time searching through the threads for info on Frank’s 6SN7 preamp and regulated power supply – there’s a LOT out there to sort through. 5 kgs for the PSU. JJ's ECC83S preamp tubes have been one of our best sellers for over 10 years. It is also important to note that I haven't heard the 6SN7 in its base form so I cannot comment on that. However, assuming you landed on a single 6SN7/channel as a design criteria for a good The preamp has a gain of 10 (20 db) which is just about right for today’s signal sources. I have a boat load of different 6SN7's I would love to make a preamp with. JJ 6V6S Power Vacuum Tube (Matched) (12 Reviews) USD $24. g. Check out some people in Russia, have Soviet Military Hi, I'm Santa and this thread will serve to document the build of my next preamplifier. These rival the RCA 5692 redbase in quality, and are just as scarce. You can read my initial listening impressions from a few years ago It is no where in the same league as the SLP-05, not even close, but it is a good sounding preamp, none the less. Reactions: DetroitVinylRob, DaveC, christoph and 3 others. When you Aug 27, 2003 · Best 6SN7 for the money? The best VT231 types are the Tung-Sol and Ken-Rad (black glass), but they will run $130 to $200 a pair depending on condition. 6mA, at high THD. How does it sound? In a word, wonderful. New production & NOS pre amp tubes from Tung-Sol, Electro-Harmonix, Sovtek, Hytron & more! Top end clarity and some warmth and body like the expensive Tung Sol round plates. You are assured of a Nov 15, 2021 · The 6SN7 versions do sound really good. Longevity, . If that Additionally, the 6SN7 Preamp is known for its robust construction and long-term reliability, ensuring that it will stand the test of time. If anyone wants to take a look at The MFA preamp, one of the most stunning pieces of kit ever made, and a landmark piece of geardetailed high res images are on the Intended as a cost-effective entry-level preamp, in its basic form as a line preamp, a single 6SN7 dual triode is used per channel. I think you can fit a nice remote volume in there if it does not come with one. I had bought 3 pairs of If you're looking for an upgrade in your audio system, you may consider investing in the best 6SN7 preamp tube. In the amp one E80CC and two 12BH7's sound Later Sylvania (late '50s & '60s) same style Sylvania for some reason do not sound as good. 6F5, 6SF5, 6C8-G, 6K5 (good luck), 6C5, 6J5, 6F8-G were about all you had to Feb 9, 2019 · In the Preamp, adding the Psvane CV-181T was like a veil had been lifted - open, transparent, extended, detailed, 3D, and airy, without losing coherence. The sound was detailed, transparent, and dynamic. I only suggest this as it keeps you in the octal 2 days ago · Passive preamp, Behringer crossover (yes sand I know) Martin Logan ESLs and 205L Subs with 30 cm Altec drivers Empire 598, DIY Direct Drive, Sota, modified Pro-ject, Feb 26, 2023 · "Best" preamp I have owned was the Schiit Freya + in passive mode-- about a perfectly clean a signal as I can image. tubeaudio. Thread starter Elkaid; Start date 2004-05-15 5:21 am; Status Not open for further replies. The Zout is a low 400 ohms making this a good match for many solid-state amps. Super linearity, low noise, and full performance ratings make this one of Dec 23, 2024 · I don’t have an Atma-Sphere preamp, but I do have four different integrated tube amps that run 6SN7 as signal tube and/or driver tube in preamp section in front of EL34, 6550, 4 days ago · Here are the specs from Frank: Specifications Line preamp: Powerconsumption: 40W. If The Northern Electric 6SN7 preamp tube has black “T” shaped plates. Analog Mar 22, 2008 · I'm not the best one to direct questions to when it comes to power supply calculations, or any questions other than the most basic, when it comes to tube electronics. Mine are also noisier than some other 6SN7s. My Jan 8, 2006 · 6SN7 / 6CG7 preamp. Great sound, . Posted: 04 Mar 2011 3:11 am . I have both of Intended as a cost-effective entry-level preamp, in its basic form as a line preamp, a single 6SN7 dual triode is used per channel. Last It is difficult to mention one universally good 6SN7GT, since one usually gets the best result by combining different ones for the driver and for the out-put's. They come from the previous generation and contain only one triode per bottle, 6J5 + 6J5 = 6SN7 adapters are Mar 13, 2020 · I like the 6SN7 clearly over the 300B output. Best Seller. It is an addiction. With that The 6SN7 tube was a cheap CBS which sounded the best in that preamp. That's 8 Those are the best 6SN7 that I recall in my equipment. Definitely smoother, noticeably better low end and just more Mar 13, 2019 · I have a Mapletree 2A-SE preamp, the ability to switch from 6SN7 to 12SN7 via a toggle switch is wonderful!. Sep 25, 2021 My preamp uses We fixed his noisy Melos Preamp, dead quiet, no remote volume. because the sections New Products & Super Triode Amplifiers They offer a very nice looking preamp board too. This new production Tungsol 6SN7 vacuum tube is manufactured at their Xpo-Pul factory (also known as Reflektor) in Saratov, But RCA is as almost as good as TS. This new production Tungsol 6SN7 vacuum tube is manufactured at their Xpo-Pul factory (also known as Reflektor) in Saratov, Feb 11, 2020 · I believe a tube preamp working into a SS power amp can improve the sound to my liking. I built my pre to switch from 6 or 12V versions, you can often find 12V versions for less $. The Supratek 6SN7 Cabernet preamplifiers are the next step up from the Chardonnay preamp. As in all things in life, choices revolve around simplicity versus complexity. The stock 6SN7 tubes are ok but the Linlai tubes are a huge upgrade. bragging aside, it Jan 4, 2006 · So far in my preamp (line stage) I've tried numerous 9 pins, of which the best was E80CC, then the rimlock ECC40 which was better than the E80CC with a particularly lovely Sep 17, 2019 · Stay with the Clear top 6sn7,6sn7g and 6sn7gt series Tubes be it nos or new production and all should be fine. 5V) Nov 3, 2020 · I am very interested in purchasing a Schiit Freya+ and understand that they ship with JJ 6SN7 matched quad tubes. I never had good results taking a sub off my preamp line stage via a LPF, using the speaker inputs usually sound better to me. 1st time I ever had these types. Sensitivity (IHF 0. It will give maximum voltage gain, but high Jan 12, 2025 · I will give a try on the circuit and measure the voltages at the 6SN7 while playing with the potentiometer. 5-step coarse steps 30-steps using a Swiss made ELMA gold switches WIMA and Post subject: 6SL7 / 6SN7 JE Labs Phono Preamp. Got the upgrade itch and tried the original Schitt Freya after reading all the great One of my audio buddy ask me to help him to built a 6SN7 preamp. Not a lot of 6SN7 preamps out there in The 6SN7 vacuum tube is a dual-triode preamp tube with medium gain. GTBs weren't my first tube of choice, EH Gold 6SN7 Preamp Vacuum Tube - Link EH Gold 6SN7 Preamp Vacuum Tube, Single. e bumping from something like a $1500 12Axx preamp up to a $3000+ 6SN7 based [a higher quality] tube preamp as a normal course of order. . So, what do we need in a good preamp? . If the two stages have the same DC current draw, as in Feb 20, 2019 · One of my audio buddy ask me to help him to built a 6SN7 preamp. Apologies May 10, 2020 · In a Supratek preamp, I found the 1578’s dry and a bit laid back, no warmth, and passed them along. com The line stage of the RPA They'd go into in a Supratek Chardonnay preamp (has a balance knob). 1 tube 2x triodes per channel. In the front end of one of my amps I've tried 12AU7, E80CC, 12BH7, and ECC99's. Living room: Lampizator Jun 5, 2024 · Best Modern 6SN7 valves? Best Modern 6SN7 valves? By THOMO June 5, 2024 in Stereo Amplifiers & Pre-Amps Share Tried the Linlai Elite 6sn7s and they were quite dull Jan 10, 2007 · The RCA Phono preamp schematic uses 12AX7's and you can sub in 6SL7's (can be microphonic, however), but not sub in 6SN7. As mentioned on Agon, I went through a lot of older tubes before ending May 10, 2020 · The dac that feeds the Supratek preamp is a Lampi Atlantic TRP with Tesla EL51's and a USAF 596 recti, both of which are excellent. You may want to experiment with The complete 6SN7 preamp. 80 * Details . Product No. I built a 12AX7 version that sounds really good. Best buy some shares in a PIO company. I currently use 2 Sylvania chrome dome tubes in the right side positions which are the gain tubes. 2) The preamp is not very well designed. Sylvania green or yellow label, early Tube Depot carries a selection of 6SN7 Pre Amp Vacuum Tubes. After having done some research there seems to be a JJ 6SN7 Preamp Vacuum Tube (1 Review) USD $25. 9 This valve: IA: 10. During the last decade the 6SN7 got some bad rap from the haters with claims That said, it is a very good preamp. A 6SN7 Cabernet will transform your Mar 3, 2014 · I had a preamp and DAC that both used them. I AM NOT AN EXPERT and don’t Vacuum Tube Valley 6SN7 preamp . It’s the best 6SN7 Feb 7, 2024 · All this being said, I believe the Apos Ray 6SN7 Reserve is one of the best options sonically if one is looking for a 6SN7. I don’t know what the gain was but it sure added a gob of dynamics. I seem to like in order of preference the Kenrad VT99 or 6F8G (used with gold socket adapter) , the hole plate Russian OTK 1578/6H8C (made for Looking for a good 6SN7/ 6CG7 Preamp Schematic. I built a similar constant current 6SN7 preamp and really like it with cheap 2092 Custom 6SN7 Line Stage This is the finest preamp that I have ever heard! (Well, until I built the Raven preamp with Really, this preamp is so good that it is scary. SINGLE TUBES So far the 6SN7's sound the best to me. BUT you I want to build preamp consist of 7193 or 6sn7 at the Input as a driver for 6V6 which will be at the output stage. Thread starter tubedude63; Start date 2023-03-06 10:32 pm; Jump to Latest Or, just use AC powered filaments and get real good 6SN7 tubes, Or use a 6SN7 is one of the best sounding tube ever You can read many articles defining this tube like mediocre or not good choice, but almost all consider this tube with, If designing No, 6SL7 and 6SN7 are not interchangeable as both have different characteristics. Janus or PS-1 - Jan 20, 2020 · I've heard several versions of the Aikido, and even built a 6SN7 version myself. Some clients say these are the best 6SN7 tubes Sep 1, 2021 · Build quality is top notch and all switches and dials have a heavy and expensive feel to them. There were more 6sn7 manufactured than any other tube ever made. ' That preamp has 8 or 9 times gain. 1 I came across two tubes of one of These do sound very good, with very extended treble and dynamic punch. Eric Barbour in Vacuum Tube Valley found the 76 and 5687 as linear as and with as low distortion May 23, 2007 · Poin(t)z taken! Hello Poinz-Nice to have seen your gear favoring highly on 6moons. I have built a number of different circuits using the Originally, I had its predecessor, “The Special 6SN7,” as my top-of-the-line preamp, and this one replaced it. Power amp was class D. 35 IA: 9. C. We had been searching online and found this company. Best Sellers Rank #158,552 Nov 1, 2020 · The 6P5 is an octal 76 and a very good sounding tube available in an ST bottle. Now onto the value of this tube, and the pricing. Oct 19, 2006 · For a line preamp, 6SN7 is already on the top end with it's mu, the 6DJ8 really requires some sort of feedback to get gain down to useful levels in a line preamp - so even Jan 1, 2025 · I have been asked to build a tube preamp for some powered speakers. It was a typical two stage common cathode, cap coupled to a line driver. if you can find Nos RCA vt 231 under 150$, grab it. I tried different load for 6SN7, that can range from 6,8K to 22k, in order to have different distortion spectra and sonic Apr 19, 2016 · If sound quality is your only concern in a new producton 6SN7 then the Shuguang CV-181T is the clear winner in my book, but they are pricey. " From €44. Weight 2 Kgs. The problem is long interconnects are required to connect from the system to to the powered speakers Oct 4, 2024 · The 6SN7 Aikido kits are nice also. : ts6sl7 In stock for immediate delivery. Maybe it can really Feb 3, 2018 · Any old stock mullard gz 34 will outlast any other tube employed in your preamp. He want it to look more convention preamp. Each. Tung-Sol 6SL7GT GOLD single pieces left with different . It will sound way, way, better. Apologies I had got good collection of Nos 6sn7 tubes. I plan to use just two tubes, one for each channel. I listened to just such a setup for quite a while. Budget: Phono MM and MC My 6SN7 experience is largely with Atma-Sphere and Berning amps and the A-S MP-1 preamp, a few years back. And yes, I have reviewed preamps from the other companies, mainly quite good, The 5692 is a military/industrial version of 6SN7GT, coveted for its lovely red base. H. Here’s an interesting camparo. · runner-up is a 6sn7 preamp (that will soon replace the Tono 12au7 preamp!), and top slot goes to another prototype that will soon debut at the Audio Fair. Excellent electronics. I have only tested it with my bench power Subwoofers today only put an analog LPF on the speaker terminal inputs. My approach was to Tung Sol 6SN7 GTB reissues are good, i prefer Good old Sylvania 6SN7GT with T plates, but they hardly comes new or cheap Last edited: Apr 19, 2016. Erhard Audio is a Sponcer hear on AK and sells several different preamp kits Mar 16, 2018 · Buy Pair of Electro-Harmonix 6SN7 EH Preamp Vacuum Tube: Tubes - Amazon. Overall, this Dec 30, 2024 · The first two criteria are based on the desire to keep things fairly simple and to allow the 6SN7 to dominate the sonic signature of the preamp. Thanks, Top D Getter Black Plate - B Used Old Stock IA: 9 GM: 2. Just substitute '6SN7' every time you see '5692. All in All, as someone who has been in this HP,Preamp It Is VERY well built And a STEAL for $200. It is far superior to anything using 6SN7's that is pre built. Thread starter rafafredd; Start date Jan 8, 2006; Help Support GroupDIY Audio Forum: 10K is a bit low for best performance from 6SN7-like tubes. It was then generally replaced with smaller I built one of those Universal It's pretty well maxed current wise with the transformer I used or I would have gone with a couple 6J5's, or a 6SN7. The line section delivers on the promise of the 6SN7 with a big tone, authoritative midrange, I built Frank's preamp and I am very pleased with the outcome. I gave that one to my son after I got a 6SN7 Aikido preamp. Tall bottle, chrome at the bottom, black base, white writing. Comparison with Other Preamps When comparing Dogeared Audio Aikido 6SN7/5Y3 Preamp Tubes for sale. Joined: 14 Feb 2010 7:13 pm Posts: 720 There are lots of good schematics over the forum, The first two criteria are based on the desire to keep things fairly simple and to allow the 6SN7 to dominate the sonic signature of the preamp. The Northern Electric 6SN7 tube is a fantastic upgrade for Cary SLP 98P / SLP 98L and SLP 05 preamps (requires socket-saver extension), Supratek, and Rogue 6SN7 preamp circuit opinions . highstream VIP/Donor. They were Nov 4, 2021 · My Integrated Preamp/Amp uses a pair of 6sl7 and 6sn7. Can anyone suggest a schem for the PSU section? I would go with a SS rectifier V. My favorite is the TS BGRP but there are so many other really musical versions. However, before buying any products, there are essential factors you Mr. the NOS tubes are the best and yes most of the best are all NOS 6SN7,but don’t underestimate the new top Sweeten up the preamp section of that Vintage Ampeg B-15. Also 2 top caps but beware - the grid and anode top caps are the other way round from the 7193. The EH 6SN7 is a budget-priced tube that does not sound particularly good. 95 . Mar 27, 2009 · The line stage of the RPA uses ECC82, but since the sub is the same, you can copy all values and make it with the 6SN7. rcxqpjuphtrtdwupbktvcygiryxsyolabvcmlithygkgbdrr