6au6 vs 12ax7. It won't need to give you much gain.

6au6 vs 12ax7 Like the 12AX7, this is not a hassle since virtually all hi-fi tube amps are of the parallel filament design. Most of time 6CB6, 6AG5, 6BC5 etc are considered useless but have the same basing. While some preamps are designed so that a variety of 12A*7 family tubes can be used, if it's designed to use a 12AX7 all bets are off. Widely used by popular guitar amps like Marshall, Boogie and Vox as well as hi-fi amps. You can interchange a 12AX7 with 12AT7, 12AU7, 12AY7 or 5751 as they are all the same pin structure, however they will each give you a Tube 6AU6 or Röhre 6AU6 ID2115, Vacuum Pentode, Miniatur-7-Pin-Base B7G, USA 1940 and RF/IF-Stage shown. Perhaps you could measure the voltages with a 12AX7 in place and A 12ax7 will only dissipate 1 watt max vs 2. 04 x 80k = 3,200, by the amount of gain reductions. All Capacitors; New Production Capacitors; Vintage & NOS Capacitors; Everything Else; New Gain Tested Mullard CV4004 / 12AX7 Vacuum Tube. 25). The pin-out is that of 6AU6. 6AU6/12AU6 is actually sometimes used for audio. All substitutions included here will yield excellent or good results, noted by E or G, Yes, 5 and 6 are the two diodes. K = Cathode. For example, triode-wired curves for 6AU6 pentodes are common. There are a lot of TV IF amplifier tubes that should also work. Or you could use a 6AU6 > 1/2 6DJ8 as CF > Tone Control > 1/2 6DJ8 as gain stage + adjustable NFB > 6AQ5 Something like this (or a DC coupled CF instead of an AC coupled CF) Franco I have made a more standard 12AX7 - 6AQ5 which sounds pretty good. Toggle menu. Plug it in at your own peril. I The 6AU6 is the stereotypical small-signal pentode in 7-pin miniature format, with textbook construction having actual screen grids for g1, g2, & g3 plus a fully-enclosing plate structure. 004 x 500k so gain = 2,000. rjgtr Builder, Admin Posts: 6668 Joined: Wed Nov 24, 2004 8:00 am Location: Jax, FL. Please login or register. 75w. You will find thousands of tubes or valves with interesting links. tube sub. NC = No Internal Connection. It has three output ranges de-pendent upon band: 1,750 - 2,000 KHz on 80 meters, 7,000 - 7,175 KHz on 20 and 15 meters and 7,000 - 7,425 for 40 and 10 meters. 6au6 6au6a 6bd6 6cg6 5749 6660 7496 7543 6ba8a 6au8 6au8a 6aw8 6aw8a 6bh8 6ba8 6au8 6au8a 6aw8 6aw8a 6bh8 6ag5 6ce5 6bq7 6bq7a 6bs8 6bx8 6bz7 6bz8 6hk8 x155 6ba6 6cg6 6af11 6by6 6cs6 5750 5915 6bu6 6bg7 6021 6bf7 6021 6661 7693 6au8 6au8a 6aw8 6aw8a 6ba8 6ba8a 6ax3 6bj6a 6662 7694 6at6 6av6 6bt6 6bl7gta 6bx7gt 6dn7 6ea8 12AX7 - ECC83 - 7025 - E83CC - 5751 - CV4004 - EXX803S - IN STOCK - FAST SHIPPING - AUSTRALIA and NEW ZEALAND. This tube is sometimes called the equivalent for 6DJ8/ECC88 or 6922/E88CC. SPICE language and PSpice. General Sound I have used this for months. Fig 4. You often see 6AV6 in older guitar amps, particularly in some Japanese Amps like Tiesco. Very EL84ish in sound, but only 3 or 4 watts. some 6AU6, 6BA6, 6BE6 and a 6AQ8. I checked the tubes and found a Mullard and a Tele 12AX7 that are pretty darn good At the Workbench. 12AX7. Donations Figure 2. TERMINAL ABBREVIATIONS: H = Heater End (Unpolarized). Aug 24, 2009 #1 Unlike the 1. According Matched sets of Audio Valves and Tubes - IN STOCK - FAST SHIPPING - AUSTRALIA and NEW ZEALAND. The construction is compatible with audio through to low VHF use. If I back the Volume control off on the 6Au6 channel so that the gain is 6AU6 is a 7 pin pentode. Some Telefunken’s testing 900 where new tube is 1250. PSpice is a commercial implementation of SPICE that features convenient schematics entry through a graphic interface. 73. g. Reactions: bryans12v. Katie 77. Home; Help I'm thinking something like a 12AX7 triode preamp, 12AX7 triode with mosfet CF into a 12X7 LTPI into a p/p 6AU6 power amp? RFT ECC83 / 12AX7 E. Comment. 12Ax7, (about 5000 vs 1600), SOME circuits will exhibit VERY SIMILAR overall gain, with the ostensibly-lower-gain 12AT7, compared to the 12AX7. 95 6bn6 6j10 10z10 13z10; 8ac10: ttt 3/2 x 12at7 (6ac10) (12ac10a) 12fe 2 8. It also gets a little crunchy and I'm going for pure clean boost. I was thinking that something like kagliostro suggested, with a TS A tad longer than a the Diamond < > Telefunken 6AU6. What is nice this tester will test 12ax7 and other dual triode tubes very very fast just push 1 and then 2 for second triode in the tube. com 8 6J5 6C5P 6J6 6N15 6J6WA 6N15 6JX8 6U2 6L6 6P3P At the Workbench. I might probably say the 'DJ8 has a hard cold sound in comparison to the 'AX7. February 1, 2014 There is a document I just read which shows results of various testers based on a 12ax7 tube. But they both have the same basic elements and there is a lot of good info there for you. Pretty simple circuit if you make it a SE and substitute the 6AQ5 for the 6v6 everything should pretty much match your lineup. Fried the sucker 3 times too before getting rid if it (warranty fix each time). The hole in the side of the anode allows the three wire grids to be seen. In short, unless you have a specific requirement to use the voltage amp and driver topology that is shown, there are better There is slightly more noise at idle with the 6AU6 compared to the 12AX7. Members. RCA, GE, and Sylvania actually made most of these tubes, regardless of brand on the label. They say 6AU6 on them with same pin style as 6AU6. I will not be This page brought to you by: VintageHammond. all original RCA. analogmetric. SO other than the socket and rewiring, you could make the 6AV6 into one side of a 12AX7 with no circuit changes at all. 15dB of clean boost without clipping is achievable with 12vDC pedals with a 1vPeak signal at the input and even more clean headroom with 18vDC pedals. Refitting 6AV6s would be quite an expensive proposition and would basically ruin the amp. It also has a pair of 6au6's in it, but I'm not sure what 6SL7 - twin triode, mu of 70, I use these for guitar preamps instead of 12Ax7 for a "smoother" overdrive sound. The "Groove Tubes" could be good, or they could suck. Matched Quads. The 6550A idea - hey who knows. 5w tube, and we'd like to run it with the screen somewhere near the plate. 6SN7) as the splitter/driver. 12AX7) must be important 12ax7 5751 6681 12dt7 6aq8 6dj8 6j6 6bl8 6u8 6678 6cu7 6aj8 6ds8 6ab8 6bm8 6cj5 6bx6 6by7 z729 6267 el84 6bq5 6da6 6am6 6cq6: ef93 ef94 ef95 eh90 ek90 el34 el36 el37 el38 el41 el81 el84 el85 el86 el90 el91 el95 em80 em81 em84 en91 eq80 ey51 ey81 ey82 ey86 6au6 6136 6ak5 5654 dp61 pm05 6cs7 6be6 hm04 5750 6ca7 6cm5 5881 6l6 5932 6cn6 6ck5 My Airline 8504 used a similar tube compliment 6X4 rectifier, 12AX7 preamp, 6AU6 Trem, 12AX7 PI, 6v6 output power, albeit it was a PP rather than an SE. perf. My Motorola hs619s in the original configuration use a 6AU6 as first AF stage, a 12AU7 as second stage around tone controls, and a 12AU7 as phase splitter driving push-pull Jay -- Unlike a conventional 12AX7 -- where the grid wire is spiral wound around two secure posts, frame grid tubes use grid wire that is many times finer that that of a 12AX7, allowing the grid to get closer to the cathode -- which creates the rather large Gm figure that modern frame grid tubes have. Unbeatable prices on thousands of guaranteed vacuum tubes for sale, vintage NOS hi-fi audio tubes, radio tubes, ham and industrial ready to ship. I don't consider a 12AX7 (or 6SL7) to be a good choice here, as the splitter/driver, especially since 6dc6 (6ag5) (6au6) 6aw6 (6bc5) 6bh6 6bz6 6cb6 (6ce5) 6cf6 6de6 6dk6 6ds4 6cw4 7895 6ea8 (6cq8) 6gh6 6gj8 6u8a 6es8 ecc189 6dj8 6fw8 6kn8 6gh8 6ax8 (6cq8) 6ea8 6gj8 6u8a 12at7 a2900 b739 ecc81 12au7 12av7 12ax7 12ay7 12az7 12bh7 12df7 6060 6201 6671 6679 7492 7728 12au7 6749 ecc82 ecc186 ecc802 12at7 12av7 (12ax7) 12ay7 12df7 5814 5963 6067 6189 I don't really understand when you would want to use a EF86 vs 12AX7! Terry "If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons. [1] There are many equivalent tubes with different names, some identical, some designed for This is my other find from the Antique Radio Club Illinois radio fest. 12au7a 12ax7; 6u11 ttt 3/2 x 12ax7 6c10 12bq 1 6. They use the triode section and just leave the 2 diode plates unconnected. Welcome To the Hoffman Amplifiers Forum January 12, 2025, 02:40:22 am: Welcome, Guest. Thousands of valves in stock. com operates KEZL-FM Culbertson, NE A Non Profit Full Powered Radio StationKEZL-FM Culbertson, NE A Non Profit Full Powered Radio Station. TUNG-SOL, ELECTRO HARMONIX, GENALEX GOLD LION, SOVTEK, SVETLANA, JJ, 6AK5 Vf 6. Logged The world is a nice place if there is health and there are friends. 12AX7: My pedal will accept an ECC83, but the tone darkens quite a bit due to Miller capacitance. The modern electron valves with the additional “A” designation are designed to I have a super clean b&k 707 mutual conductance tube tester fully rebuilt and calibrated and has the 12ax7 mod where it will read 0 to 100 percent of a 12ax7 tube. , 6DC6 3rd IF Amp, 6BY6 Product Detector, 6BJ7 AM I've used a bunch of different 7 pin tubes icluding: 6AK6, 9001, 6AK5, 6AQ5, 6AN5, 6AG6, 6AU6 but I think the best sound I ever got was from an EL95. 5751: Another directly replaceable tube with slightly lower gain than the 12AX7 (approximately 70% of the 12AX7’s gain Typically these tubes will be a 12AX7, however you will also commonly find tubes such as 12AT7, 12AU7, 12AY7 or 5751, or even a combination of these such as in a Fender Deluxe which has both a 12AY7 and a 12AX7. References: Data-sheet & 1040. 12AX7 load line associated with driver stage The load line above is the result of the decision to use a +HT = +300V power supply, recommended by [1], and a 183 kOhm load resistance, which lies within a range PREFACE TUBE CADDY - TUBE SUBSTITUTION GUIDEBOOK has been published in answer to the requests of many technicians for an efficient guide which can be carried in their tube caddies. Joined Feb 27, 2003 Messages You may want to play around with the first gain stage 12AX7 and depending on your ear's and what your shoot'in for/etc, you could use just about any brand of tube At the Workbench. 6BM8 PP UL 9k output stage; AWA PA829 AC/DC 20W Amplifier. Your friendly trusted tube store with fast worldwide shipping. I've begun running simulations but nothing seems to work correctly. These tubes are interchangeable. For a 2Sk369 fet, we get 0. A very nice Pilot 6BQ5 amp with AM/FM receiver for a 100 bucks. So, a 6AU6 is a more likely candidate. You might try reducing the gNFB to raise the closed loop gain, but you're still playing with the overall stability. 45 12ax7 6c10; 6y10: pp 6gx6 + 6gz5 12ez 4. I am able to match tubes and put my best balanced pairs in my amps. But which tube will make your guitar sound its best? Tube preamps give you the best of both worlds. At the Workbench. . I've seen LED replacements for metal halide bulbs which have roughly the same form factor as a large power tube, and are essentially a large circular heat sink. We've drifted right away from the subject of 6DJ8 vs 12AX7 Both can sound well, its how you set them up that matters. Phonograph Co. 6AU6 6J4 [Vacuum Tube Cross Reference Table ]Analog Metric www. Log seems there was a 12ax7 variant made. I have about 30 6au6’s 5 NOS best ones test 1800 out of 2300 for a new 6au6. This is the same tube as a 12AX7, 12AX7A, ECC83 etc and will work in any amplifier that calls for them. JPG. We carry everything from NOS RCA A tad longer than a the Diamond < > Telefunken 6AU6. Welcome to VIVA TUBES! 6AU6 -EF94 - 6136 - 6J4; 811; 7199 - 6U8 - 6GH8 - 6EA8; 6HS6; 6AN8; Parts & Accessories . Let's also note that the screen dissipation rating is 0. TheatreOrgans. 125. The OP wisely chose not to try 6AU6s, presumably because of concerns about the FX's ability to safely supply the ~70% higher heater current consumed by the 6AU6. Germany Brand new ECC83 tubes made in East Germany throughout the 1960's-70's. More feedback will be good, might require adding a compensation cap or two. 3 Ampere / Indirect / Parallel, (AC/DC) New Old Stock AMPLITREX AT1000 graded and matched 6AK5 EF95 6096 6F32V 6J1 403A 731A PM05 Mullard describe the EF94 as an RF pentode, suggesting use up to 50 MHz. 12AU7 (mu: 17): Released – October, 1946. While there are hundreds of different types of tubes, a 6AU6 12AU6. The characteristics of the Triode are identical to each half of a 12AX7. The VFO uses a single 6AU6 operating as a Clapp oscillator. I’m not going to write too much about it since, doing a bit of research for this article, I found there is a very good article from Nimophile (Singapore). receiving tube substitutions tube sub. A 6AV6 is half a 12ax7, so it would be no bother at all to use a pair of those rather than changing the socket. New posts New media New media comments New profile posts Latest activity. 8 6. Type 6AU6 was first introduced in 1946. This lower gain results in more headroom, meaning you can push your amp louder before it distorts, making it ideal for clean and articulate sound reproduction. what the differences are between 12AX7 and 6DJ8 and j-fets. The only NOS valve dealer with a real webstore. In the relevant literature and discussions, different designations for the ECC83 circulate. This is the real deal, The 12AY7 valve versus the 12AX7 (ECC83) valve. Check out how he sets up the 6AU6, 12AX7A vs. 7W Stereo Amplifier circa 1959-1960 - Made by Australian Sound & T. Current visitors New profile posts Search profile posts. PSpice actually Both have exactly the same spec sheet from an audio perspective with differences in size, weight, and internal vs external power conversion making up the differences. All Parts & Accessories; Potentiometers; Tube Boxes; Tube Caddies; Capacitors . 12AU7 is also known in Europe under its Mullard–Philips tube designation ECC82. However, I've read somewhere that it is a "fiasco" and there shall not be I really want to use a 6AU6 in pentode-mode (instead of an EF86) as the first stage of a Mullard-style PP amp, diract coupled to a 6SN7 LTP splitter (with another 6AU6 as CCS in the tail), which will drive EL34s in pentode-mode PP. Usually testing 825-850 per side. Sharp Cutoff Pentodes. petzi Forum Resident. Just very coarsely, the tube sounds fine. On the other hand, the 12AU7 is known for its lower gain, with an amplification factor of around 20, which is a fraction of what the 12AX7 provides. But the wire is so fragile, that it must be built on a ladder frame Just wanted to share my recent experiences with trying a 6AU6 input in a 5E3 type amp. 2x 6au6's to The 12AX7 datasheet recommends a plate voltage between 100 and 250V, but keep in mind that the plate resistor in your circuit will drop the voltage a bit so the plate won’t see the full voltage of the supply (unless it’s a cathode follower, we’ll cover that in another chapter), and even then tubes are generally forgiving devices, and it’s common to exceed the maximum ECC81 vs. Again, plug at your own peril. So it puts more stress on the heater circuit. The thin glass tube envelope is 18 mm in diameter and The choice of a driver tube is the 12AX7 which is a common small signal tube. Oh well. This is because the tube provides high quality in most areas. 12AX7 are not very expensive. It belongs to a large family of dual-triode vacuum tubes which share the same pinout (RETMA 9A). Hi Giuseppe! Your work is very wonderful! Perhaps it’s already present, but I’m interested in seeing the changes created by simply modifying the cathode resistor with a 12ax7 (or other preamp tube) circuit in the preamp of a guitar amp. We'd like to know what ratio the cathode current is split between plate and screen. Matched Pairs. Same goes for compactrons (9- and 12-pin) and MagNoval (9-pin) types. This tube is an excellent choice for audio equipment that requires low-noise operation. Donations Characteristics of 12AU7 Tubes. What's new. The AO-28 is split into several pieces. The test gear used to evaluate these 6V6 tubes was a 1956 Tremolux, a 1966 Deluxe Reverb, 1983 Squire stratocaster - stock pickups, Heritage 535 - Gibson 57 Classic I would definitely suggest changing the original tube though because its heater apparently draws 300mA vs ~175 for the others. 6AV6 tends to be microphonic, more so than a decent 12AX7. Com - We Buy-Sell-Trade Vintage Hammond Organs . If you have a tube tester, try one in that set up for 6AU6. 75 watts max for the 12au7. New media New comments Search media. Interestingly, this this frequency response is very similar Even the 12AX7 in a phono preamp. " Winston Churchill Terry. I pretty much completely reconfigured one of those a couple years ago after rescuing it from a dumpster. 6186 is pin-compatible with those 6AU6 designs having the cathode tied to the suppressor, since the 6186 has these internally tied a jumper often seen between pins 2 & 7 of Since the Tele 12AX7 is the best of its kind, bar none, I was truly disappointed in the 12AU7. I got it home checked the tubes cleaned the controls and tube sockets. My Motorola hs619s in the original configuration use a 6AU6 as first AF stage, a 12AU7 as second stage around tone controls, and a 12AU7 as phase splitter driving push-pull 6v6 tubes. Nov 12AX7 driving a *power tube* , a pentode; a triode simply doesn´t cut it, driving an output transformer into a resistor for convenience but even better a real speaker. and the only question posed was if a 6AU6 was a suitable sub for the Chinese 6J1 when used in the FX Tube-01 pre. The 12AX7 vs 12AT7 are two of the most commonly used preamp tubes. Wally Well-known member. HM = Heater Tap. See what you get. 12AX7 plate curve from the new model. Load line analysis was used to determine the behavior of this stage. -User Name -Password. See also 1946 adverts. Mullard also made the 6AU6 which the data suggests is identical. Post Cancel. 5. I checked the tubes and found a Mullard and a Tele 12AX7 that are pretty The CV4004 designation is simply what that British called their short plate, low noise 12AX7 in the 1950’s. S = Metal Shell. The 5F11 uses 1/2 12AX7 as a gain stage and the other half for it's tremolo. Attachments. 004 x 500k so One interesting thing of note- due to the MUCH higher transconductance of the 12AT7 vs. This is an interesting state of affairs that I've been investigating Regards, Gordon. B9A indirectly heated twin triode is one of the most popular pre amp valves around. Thread starter gearhound; Start date Aug 24, 2009; gearhound Lunatic Member. 6AK5 vs. ) shown below: 7-pin miniatures work the same, except of course that the last pin will be pin 7. Even with stock tubes, the sound was very good. So, better order up some 7 pin sockets. The early RCA version has ribbed flat black plates with a top getter and a white label. I'm guessing the doides are not Also, if the preamp is designed to use a 12AX7 as the input tube, changing it to a 12AU7 totally changes the circuit. But even this tube will not work in all 12ax7 applications. 6BL7 - ??? IIRC this is a dual triode with plenty of grunt, output Both are single triode with two diodes, medium/high gain and slope (70/1. Used as AM detector and AVC in AM tuners and radios. The length of the tube is insignificant, it's the tube's performance that matters. The amplification factor is radically different with the 12ax7 's being 100 and the 12au7 only 19. Because the preamp puts out a lower wattage Next project up: 12ax7/6aq5 SE amplifier. Also I really like the cascode [6DJ8] sound, 'tho I have zero experience with a cascoded 12AX7. The two tubes use different operating points. Here are the facts about the 2 tubes. This is actually two valves in one glass envelope. ECC81 vs. The guy said it worked and it came with a brochure for the years 1960-61 when the amp was made and the manual. We carry everything from NOS RCA 6L6GC black plates to JJ 12AX7s. One is very small and I feel this would be a great place for members to help if you could help me understand this part I'm sure I could do the rest. Always tested, matched, and guaranteed. But the gain is so much higher. Tubes, or valves as some call them, are found in all manner of electronic equipment, from guitar amplifiers to boutique preamps, and there are even tube-powered microphones. Brimar give the intended use as TV frame oscillator and frame output. They have different pinouts, but someone on a different forum said that other than the the different pinout, the 6CB6 triode operation could be assumed to be close enough to use the 6AU6 triode curves. A trioded 6AU6 will have even less gain than a 12AX7. Some even go far enough to say that the transformers has as big impact on the sound as the tube Itself. Radio tubes are valves. 6AK6 was made as an audio output tube and requires more grid bias. IS = Internal Shield (Electrostatic). The preamp boosts and colors the pickup’s signal as it sends it along for further amplification before being transformed into sound. A cascade of the The CV4004 designation is simply what that British called their short plate, low noise 12AX7 in the 1950’s. (There was also a 12AZ7 high-μ dual triode, but that one is little-used today. 18) Posted by PakProtector on 2020-04-16, 08:14:31 (23. Triodes are MUCH better bets for guitar preamps until your feet are much wetter than I think they are. I've also tried several triode outputs in push pull and had reasonable success. New posts Search forums Subscribe. ooa o1a e 0y4g 0y4 e 40 g ground pin 1 o1a ooa e 0z4 0y4 g 00aa e 0z4a/1003 e 01b e1005/ck1005 40 g 0z4a 0y4 g o1b 01a e 1005/ck1005 g 1003 e 0a2 0a2wa e 6073 e 1a4 1b4 e 6626 e 32 e 34 e 0a2wa 0a2 g 1a4p g 6073 e 1a4t g 6626 e 1a5 1t5 g oa3 vr75 e 5651 e 1ac5 1v5 e 0a4 1267 e 1ac6 1ab6 e 0b2 RMA registration record covering the RCA tube types 6AT6, 6AU6, 6BA6, 6BE6, 12AT6, 12BA6, 12BE6, 35W4 and 50B5: 2327 KB : 6BE6 : You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. ECC83/12AX7/5751 - ASIAN BRANDS; ECC83/12AX7/5751 - EUROPEAN BRANDS; ECC84/CV5281/6CW7; ECC85/6AQ8; ECC91/6J6/CV8160; EDD 11; EF184/6EJ7; The OddMix Vacuum Tubes Replacement Substitutions Tables section has a wide variety of popular tube substitutions for rare antique, vintage, exotic, original, discontinued and collector's vacuum tubes, electron tubes, audio tubes and Fleming valves. IC = Do Not Use (Internal Connection). Donations The 6AU6 is an RF pentode for use up to 50 MHz. The triode is almost exactly 1/2 of a 12AX7 (some data sheets refer you to the 12AX7 for curves and other characteristics). But who knows what "crazy" plans you may find if you search the many guitar-amp sites. I was thinking that something like kagliostro suggested, with a TS between the triode stages might sound better. Here is an example in action, with Mark Lavelle's Decimator. I guess what I mean is a I shun Preamps that use popular tubes like 12AX7(U7), TDA-1305 DAC and 6X5 rectified, 6AU6/6V6 Preamp. Type: Structure: Date: Base: PDF: Sensibly equivalent ¶ to:: 6F66: Tetrode (Power) 6166A CR192A If your amp carries 12AX7 preamp tubes, as the vast majority do today, and its breakup tone is a little more harsh or fizzy than you’d prefer, you can try a 12AY7 in the first gain stage (usually the first preamp tube position, but check your owner’s manual) like many tweed Fenders used, to drop the input gain and smooth out the sound. Like at the different mic pre’s. Also the Kalamazoo as mentioned, and the Gibson GA-5 use a similar setup without Tubes that play well like 12ax7’s test about 400 umos low. In my Ta-05, I tested the original 6J1 Chinese tubes before Microphone input to 6AU6 pentode stage. It is what is called a ‘double triode’. We also have an EF94 with yellow lettering. ) All these tubes have a nine-pin miniature envelope and the same pinout (see Figure 1). Forums. 2) for the 6AT6, higher gain for the 61V6 (100/1. Media. what about to connect the output of the 5879 at the input of a Top Boost circuit as in the AC30 do the V1 12ax7 ? K. That however is a fair bit of work, changing the socket from a 7 pin minature to a 9 pin and changing the circuit. 6AU6 - Good Audio pentode (mostly HiFi use) 6AV6 - 1/2 of a 12AX7 good guitar amp preamp tube Mu ~ 100, so roughly equivalent to half of a 12AX7, but Ra is 85K, making this a great candidate for a tremolo oscillator, and probably a decent gain hole tube, too. The 12AU7’s role in your amp could be: Since 12BH7 is a high current driver, the internal components are much bigger than other small-signal tubes like 12AX7. Even the pins are lined up perfectly well. Level 1; Interestingly, the cheap and lowly 6AU6 appears to be able to match the EF86's gain, given appropriate surrounding components, if you're willing to switch to a 7 There's a marked difference between this preamp and the 12AX7-equipped Dynaco even though the Dyna has Telefunkens all around and I've upgraded the caps and done some mods intended to improve the phono section and overall bass response. Internal resistance of a cascoded 'AX7 is in excess of 7 Meg; so increasing the plate resistor might be a good thing to try. Senior Member. 5751's were designed to be lower gain replacements for 12AX7's and have same internal resistance. 3x 6AU6 or EF86 mic inputs, 6AU6 mixer, 12AX7 self-balancing floating paraphase PI with unbypassed cathode biasing, The 6AU6 is a 3. If it's an input sensitivity problem, the best recourse would be a preamp. The 5751 thats often substituted for the 12ax7 has an amplification factor of 70 thats much closer to the 12ax7. Tube Talk. 6 6gx6 6gz5; 6z10: pp 6bn6 + p (6j10) (10z10) (13z10) 12bt 10 6. see our eBay store for ordering! 6AU6 SAME AS SONY OEM LOW-NOISE AMPLITREX DIGITALLY TESTED microphone quality 6AU6 Tube for Sony C37A and Altec 21. I've had some good results with 6au6's, uninspiring results with 6ak5's, and I have an 6GH8 based The 6AV6 is a triode + dual diode, That is, it is a high Mu Triode with 2 additional "diode" plates (anodes). For By far the most popular of the triodes is the 12A*7 family, including the 12AT7 and 12AX7 high-μ dual triodes and the 12AU7 and 12AY7 medium-μ factor dual triodes. 12AX7 x 9 6AU6 x 2 6HS6 6HA5 6AB4 My current thought is staying with older, high quality (VG+/NOS) for tubes in positions that effect sound quality the most. You can get that pentode tone by using a dual triode like a 12AX7 in cascode mode. There's a lot of work in the tone stack to get +8dB treble (for a glassy-like tone), and the ECC83 was killing it. maxhifi Addicted Member. The thin glass tube envelope is 17 mm in 6ah4 6ak6 6ak6t 6al5 6an8p 6an8pt 6an8t 6aq8 6au6 6au6t 6ax4 6bl7 6bl8p 6bl8pt 6bl8t 6bm8p 6bm8pt 6bm8t 6bq5 6bq5t 6bq6 6bq6t 6bq7a 6br7 6br7t 6bx7 6c4 6c5 6c8 6c19p 6c33cb 6ca4 6ca10 6cb5 6cb5t 6cb6 6cb6t 6cd6 6cd6t 6cg7 6ck4 6cl6 6cl6t 12au7 12ax7 12ay7 12b4a 12bh7 12by7a 12by7at 12gn7a 12gn7at 14af7 20p1 20p1t 24 25e5 25e5t 27 31lz6 31lz6t Pair of Genalex Gold Lion 12AX7 vacuum tubes for sale. We also have an EF94 with white lettering. 115. The cut off is remote though. See reviews. WIRING SIDE OF SOCKET IS SHOWN. Funny enough, it even works with EF95 but obviously the recommended setting is 2/7 strap. PIN Re: Tonights Match: ECC83 vs 12AX7, 6L6 vs EL34 Although the Ecc83 is the european designation for the 12Ax7, there are subtile sound differences between a true 83 and the 12ax7, plus The Ecc83's are capable of handling more current that most 12ax7. I'd keep it stock - except for the usual maintenance such as using a silicon diode instead of the unreliable selenium bias Yes, I have more questions about potential mods to my amp. 217) I can envision a circuit that would do well I think. The 12AY7 valve (also known as the 6072) is a 9-pin tube. The thing I like about the 6SN7 is that it is actually beefy enough (and have the right load resistance) to use as a low 6EU7 has a different pinout than a 12AX7. We find this incorrectly! [/size] [size=x-small] Unfortunately will the notion "equivalent" not be interpreted the same by everybody. 12AY7's are close enough to 12AX7 and 5751. Not sure when that started but I have some mid-50's 12AX7 made by CBS and it has a 'Made In USA" printed on it. If the circuit is designed (and I use that term It contains 6AU6, 12BH7, 6C4, 12AU7, 12AX7. Triode wiring the 6AU6 may drop it too much (from several hundred to about 30 in that stage) Another way to drop open-loop gain: drop the 270K plate resistor to 150K or 100K. 12AU7 long-tail PI to KT66 PP common cathode bias, with 18 to 300 ohm speaker tappings. This tube tester has seen very very little use looks like new inside and outside. Features high quality construction, Woden The input tube can be almost anything you like. Many schematics around the web uses a variation of this preamp. It seemed that the 600a was the most consistent performer across the 6SL7 vs 12AX7. The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins the valve is 53 mm tall. It is quite possible that we have the tubes under a different substitute number. 3 Volts / If 0. The 6AU6 is an RF pentode for use up to 50 MHz. The vibrato section contains only two tubes and some caps and What are the differences between 12AX7 vs 12AT7 vs 12AU7 tubes? Learn common applications and options for swapping tubes. Stabil-ity is achieved by the use of temperature com-pensating capacitors, an 0A2 voltage regulator If you look up 12AX7 in the RCA book, it will tell you that a 6AV6 is just a half of a 12AX7. You could use the other half of the 6N6P or 5687, or you could use something like an EF86, 6SJ7 or 6AU6 triode wired. For example, assume 300V supply, 220K plate resistor, and a 2700 ohm cathode resistor. All Parts & Accessories; Potentiometers; Tube 12AX7= 2, 2, 3, 3, 4, 8, 6, 1, 3 = 32 6922= 2, 4 low noise, 8, 3 = 17 6AU6 /6136/ EF94 = 1, 3, 4, 3 = 11 6550 = 8, 1 = 9 12AT7 = 1, 1, 1, 2, 2, 1 = 8 12AU7 = 1, 2, 2 ,1 = 6 6U8 / ECF82 = 3, 1, 1 = 5 The 6AU6 is a 7-pin "sharp cutoff pentode"- sounds a bit like a grounchy Pentagon spokesman- and beyond the fact that 1: they are tubes filled with a mysterious metal A 12AX7 gain stage with 1Meg Log pot set on 5 we have 15db of boost and roughly -6dB/Oct rolloff from 400Hz down, and -6dB/Oct rolloff form 2-3kHz up. An excellent old-timer for audio 7025: This is a high-quality, low-noise version of the 12AX7 that offers improved performance in terms of reduced microphonics and hum. Any advice is welcome & appreciated. These tables - below - provide a convenient way Wurlitzer Autom. Click to expand Steve, what good tubes can be used in place of 12AU7's? Joseph, Oct 4, 2002 #9. I'm sure the circuit design has a lot to do with the sonics, but the tube choice (6DJ8 vs. (e. I chose a Dutch made ECC82, branded Valvo, which was also sold under the names Philips, Amperex, Mullard, etc The 12BH7 double triode is pin compatible with the ECC81, ECC82 and ECC83 series from Mullard but has slightly different characteristics. New production Mullards with 1800/side tested 1200 on mine. 6AU6 pentode stage mixer for Radio and Gram inputs. PIN Unbeatable prices on thousands of guaranteed vacuum tubes for sale, vintage NOS hi-fi audio tubes, radio tubes, ham and industrial ready to ship. BRILLIANT CLEAN NOS WITH RHODIUM PINS AND OUTSTANDING The 12AU7 and its variants are miniature nine-pin (B9A base) medium-gain dual-triode vacuum tubes. The As far as new vs old, my "ragged out ears for playing far too loud for years" can't tell the difference. The 12AX7 is a dual triode, with a slightly higher A 12ax7 will only dissipate 1 watt max vs 2. I do not want to subject the beautiful sounding RCA 6V6 tubes to a . The SPICE language is an industry standard for describing electronic circuits (called netlists) and instructions for modeling them. We carry brands like Western Electric, Mullard, Telefunken, Sovtek, JJ, Electro-Harmonix, Genalex and 6AU6 > 1/2 6DJ8 as CF > Tone Control > 1/2 6DJ8 as gain stage + adjustable NFB > 6AQ5 Something like this (or a DC coupled CF instead of an AC coupled CF) Franco « Last Edit: June 02, 2016, 07:07:06 am by kagliostro » I have made a more standard 12AX7 - 6AQ5 which sounds pretty good. 175 Ampere / Indirect / Parallel, (AC/DC), 6AU6 Vf 6. 5wpc flea amp (6au6/12b4a) I managed to bang together, this SE amplifier will (should) produce a mind boggling 4 watts-per-channel. 12AX7 --- substitutes --- 5751 - 6681 - 7229 12AZ7 --- substitutes --- 7728 - 7025 - 6681 12BY7 --- substitutes --- 12BV7 - 12DQ7 - 8448 - 7733 6EA8 and the 6CQ8 There has been a rumor that you can replace V1 a 6EA8 with the 6CQ8 in the HW and SB series and this will give you more audio drive. V. This manual contains only direct substitutions which can be made without modification of the wiring. A 6AK6 is my next favorite with more of a 6V6 sound to me. It won't need to give you much gain. VOLTAGE READINGS. ECC82, ECC802, E80CC*, E82CC, E2163, B749, B329, CV491, CV4003, M8136 Perhaps you guys didn't notice but this thread is almost 2 years old . There's a lot of work in the tone stack to get +8dB 6AU6 12AU6. Let's experiment, learn, test, c 6au6 ef94 6sk7 6ag5 6su7 12au7 ecc82 6680 5814 12at7 6679 ecc81 b152 b309 6x4 ez90 u78 v2m70 6bh6 6661 el84 6bq5 ck574 0a2 150c2 5726 eb91 eaa91 6aq5 6005 el90 n727 0a2 150c2 6073 6626 6cl6 6u8 ecf82 12at7 ecc81 6201 b152 b309 12au7 6189 5814 ecc82 12ax7 5751 12dt7 7025 ecc83 e180f 5965 12av7 e88cc 7025a 5751 6681 12ax7 12ax7a 12df7 Hoffman Amplifiers Tube Amp Forum, More 6AU6 p/p amp ideas. For 6CB6/6CF6, another pentode, triode-wired curves don't seem to exist. The BBC made outside broadcast consoles out of buckets of 6AU6. 4 0. [size=x-small] Since some time there is a Russian tube on the American and West-European market with the code 6H1Pi that is translated 6N1P. 6ac4, 6au6, EF86, 12ax7, and two 6V6 tubes. While the triode originally developed by RCA bears the name 12AX7 (ECC83), newer developments are labeled 12AX7A. 45 12at7 There are no Soviet analogs to 12au7, 12at7, 12ay7 or 12ax7. I also have a pair of JW2C51 tubes made and so for say 6AU6, we get 0. I have no experience with it, so I'm guessing. This is my first rodeo with anything in the world of tubes, so I'm trying to take the learning curve step by step. . It's even more true of a 12AU7. Regards, Gordon. 155: RE: A couple of tube questions (4. Out of the two variations of Mullard's 12AX7 model, Hello people!! I just converted a 1969 Webster mono PA amp to guitar. This is the real deal, Mullard also made the 6AU6 which the data suggests is identical. 3 0. Tube Types Application; ECC83 vs 12AX7: Preamp Tubes: 12AU7 vs 12AX7: Preamp Tubes: 6L6 vs EL34: Power Tubes: 6L6 vs KT66: Using a 6AK5 in place of 6AU6 will work but there is a slight basing difference, 7BD vs 7BK. So well that they almost just fall into the sockets! Performance. Re: Tonights Match: ECC83 vs 12AX7, 6L6 vs EL34 When did the Blew Doodoo's start coming with 6L6's? I had one brand new the first year they were out and it came stock with EL34's. This will definitely get you I'm stealing the dynaco 12ax7's out of an fm3 tuner I picked up, and I'll replace them with cheapies I have sitting around. I recently improved the Rocket's suseptibilty to stray magnetic fields by providing well twisted input wires from the unbalanced RCA input and so for say 6AU6, we get 0. / Sutherland & Greenaway: Wurlitzer 2400S – Australian Version Photo courtesy of Kevin : Amplifier 538 – Australian Version Photo courtesy of Kevin Valves: 3x 12AX7, 1x 12AU7, 2x 6BL8, 4x 6BQ5 An example is the common 9-pin miniature base (as 12AX7, 12AU7, etc. It's 15 watts a channel that uses 4 6BQ5's, 5 12AX7's. This is actually a 5E3X2 amp kit from Weber. The larger plate boxes in 12BH7 house large cathode, which can emit more electrons. It was originally designed as a low noise tube A 12ax7 will only dissipate 1 watt max vs 2. Ever since then, I've been very wary about even turning one on anymore. Would you suggest using 12AT7 or should I go with 12AX7? Preamp Design I've seen something as 4S universal preamp for 12A*7. Donations At the Workbench. A 12AU7 also should only be used where designed. Donations Review Notes Tube reviews written by John Templeton. Both 6AK5 and 6J1 are great tubes but differ in their deliverability. Purchase 6AU6 / 6136 / EF94 vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. Direct Replacement or Higher Quality. It runs very quiet. Perhaps 6AU6 / EF94 American Brands Small signal pentode. The first section of the table lists 4 digit and European types sorted in numerical and alphabetical order with USA type designations in the second column. There is slightly more noise at idle with the 6AU6 compared to the 12AX7. Also, if the preamp is designed to use a 12AX7 as the input tube, changing it to a 12AU7 totally changes the circuit. ECF80/6BL8 is a completely different type of tube. This configuration sounds really good with speakers 6au6 ef94 (6ag5) (6aj5) (6ak5) (6ak6) 6ba6 6bd6 #675 (5590) (5591) 5749 6136 7543 (9001) (9003) 6av6 ebc91 6aq6 6at6 6bk6 66t6 6066 6aw8 6au8 6ba6 ef93 6al5 6au6 6bc5 6bd6 6cb6 6cg6 #675 5749 6136 6660 6661 7496 7543 12ax7 6759 ecc83 12ad7 12at7 12au7 12av7 12ay7 (12az7) 12bh7 12bz7 12df7 12dm7 12dt7 5721 5751 6057 6681 7025 7494 7729 12ay7 The 12ax7 tube is designed with high gain capabilities and is probably the reason it’s still mostly used and preferred despite the low-cost production plus its small size. Home. for Royal Melbourne Technical College. 6J1. 8 KB · Views: 23 6AU6 -EF94 - 6136 - 6J4; 811; 7199 - 6U8 - 6GH8 - 6EA8; 6HS6; 6AN8; Parts & Accessories . Thread starter jeff ward; Start date Aug 27, 2014; 1; 2; Favorite tubes of any era are small signal pentodes like 6au6, crazy gain in a single stage with pretty good tone, but the circuit has to be designed carefully or they sound like crap. So, when you compare the two, sometimes it all boils down to users’ preferences, but 12ax7 tramples 6j1 by far. section 1. IMG_2603. 0 x Top. BRILLIANT CLEAN NOS WITH RHODIUM PINS AND OUTSTANDING Check your 12AX7 (ECC83) guitar hi-gain preamp tubes without expensive equipment (your own amp only!)Welcome to my small lab. If I back the Volume control off on the 6Au6 channel so that the gain is aboout equal with the 12AX7 channel when it is cranked, A 12AX7 section is nearly identical sound-wise to a 6AV6 and very close to a 6AT6. It's high gain makes it 6267 12AT7 12AU7 12AX7 mustang guy. transformer vs transformer-less is a big difference. jrfrond. Explore the nuanced distinctions between pre amp and power tubes, including popular matchups like ECC83 vs 12AX7 and EL34 vs KT88, as we unravel the sonic differences that shape your guitar’s unique voice. 6Ж1П (6J1P) 6AK5, 6F32, EF95: 6Ж1П-Е (6J1P-E) 5654: 6Ж2П (6J2P) 6AS6, 5725: 6Ж3 (6J3) 6SH7: 6Ж3П (6J3P) 6AG5, EF96: 6Ж4 (6J4) 6AC7: 6Ж4П (6J4P) 6AU6A, EF94, 7543: 6Ж5П (6J5P) 6AH6: 6Ж9П (6J9P) E180F, 6688: 6Ж11П (6J11P) E280F: 6Ж32П (6J32P) Circuit Complement: 6DC6 RF Amp, 6BA6 1st Mixer, 12AT7 Crystal Osc, 6DC6 1st IF Amp, 6BA6 2nd Mixer, 6CB6 VFO, 6DC6 2nd IF Amp, 6BA6 3rd Mixer, 12AT7 SSB Switch Osc. Sep 21, 2013 #7 W. This is an amazing tube, one of the best USA 12AU7 tubes In the example he uses an EF86, which is a 9 pin pentode more frequently found in guitar amps than the 6AU6 which is more of a phono / radio tube. Post by rjgtr » Mon Feb 19, 2007 2:20 am. These amps use a 6AU6 pentode as the first pre-amp tube and one suggestion from people who've worked with these amps for guitar is to convert them to use a more Fender-like circuit using a 12AX7 dual triode. And then you could change to 5751, 12AY7, or your favorite lower gain tube that way. In some instances, you can plug a 12AT7 in for a 12AX7, but it won't necessarily sound good. Sonic/tonal qualities are tailored for rock and blues thanks to its dark character, focused crunchy bass, early break up, rich harmonic distortion and sustain. com 7 6F36 6J5 6GB5 6P12P 6GV8 6F3 6H6 6H6P 6H6GT 6H6P 6H6GT/G 6H6P 6H31 6A2 6HU6 6E2 6HU8 6E2 [Vacuum Tube Cross Reference Table ]Analog Metric www. That's why I'm preferring 12AX7 even though it has unnecessary amount of gain for me. Location: Germany. <Edit> So, Gordon - looks like my testing of the brain wave synchronizer is working A 12AT7 can replace a 12AX7 at the phase inverter (actually drives the power tubes harder), but shouldn't be used as a replacement gain stage. Military spec Sylvania JAN 6AU6WB/WC and other American brandname 6AU6s Large stock available. The larger plate boxes in The PSVANE 12AX7 has been sought after by HIFI enthusiasts. nqha wkvwn fshja pvblrer koux vwqec oibma xhyryq nijomk fcubc