The 7025 is a 12AX7 with hum reduced heaters, for example. compared to 12AX7's and ECC81's. While not exact, it would give you the opportunity to audition the sonics before changing out the socket. The 6SN7, is so close to a 12AU7 that I would say any sort of self split 12AU7 design would work identically with a 6SN7. 4 Vintage Fisher Telefunken 12AX7 ECC83 Stereo Tubes. With the 12AX7 being such a popular tube in. Super linearity, low noise, and full performance ratings make this one of the best 6SN7 tubes ever made. Related products. For 9-Pin power tubes like the EL84 the plate is pin 7 and the cathode is pin 3. If running off 12. This tube provides a fat and smooth tone, overall more musical than the newer 12AX7 (kinda like the difference between a 6V6 and an EL84, to give some perspective). Even more impressive is the fantastic breakup / drive of this tube. 1590 West Algonquin Road #111 Hoffman Estates, IL 60192 Voice Phone 847-496-4546, Monday-Friday 8AM to 4PM USA Central Time. 6K, and you may occasionally see very large value resistors, such as 470K or greater, in. 75 Tung-Sol FOUR QUAD Factory Platinum Matched GOLD 6SL7 6SL7GT GOLD Tubes. The Best 6SL7-type tubes ever made? An Update If this is your first visit, be sure to check out the FAQ by clicking the link above. DOUBLE TRIODE. There may be similar for the 12AU7 12AT7 and maybe the 6SN7. INTRODUCTION. This tube was first produced by RCA which called the 5691 one of it's "SPECIAL RED" tubes due to the red colored low. My siding with the 6SN7 tube over the 12Au7 is actually based on the air and ambiance, and complete lack of noise I have received from good octal tube preamps. Classifieds: FOR SALE - Another 26 Audio Vacuum Tube Lot ECC83 6SN7 6SL7 6CA4 5Y3 12AV7 asking for $225. Although both are dual triode tubes, the latter is a power triode type and the circuitry required will have very different requirements than 6SN7/6SL7 tubes. The above SPICE models for various valves and most of these models are for use with PSpice from Orcad. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. I have been using a 50s Bogen head with 2 6v6, 1 6SL7, 1 6SC7, and one 6SJ7. CV569 Mullard Military designation for ECC35. The 6SL7 is an octal twin triode with amplification factor (mu) of about 70. Natural Sound 6SL7-T. Just a preamp and I have it running into Fender PA with 2 5881 and a 12AX7 like a brownface 6G6B. 12AX7 6SL7 6SN7. similar to 5751 gain. Second tube is a 12AX7. ****OUT OF PRODUCTION***NLA****. I've been living with a set of PSVANE 12AX7′s for a few weeks now and so far, these are great sounding tubes. I have always wanted an amp that used 6SL7's in the gain stage. The "7" in the leading digit. According to us, must a tube which can be. 6SL7 / 5691: 70: 44k: Similar to 12ax7; fuller sounding, but noisier: 6SN7 / 5692: 20: 7. For example, don't expect a 12AX7 based Cathode Follower to drive a 600 ohm load to 10 volt peaks just because it has a 600 ohm output impedance. The 12AU7 vacuum tube was first marketed back in October 18, 1946. A 12AU7 would have worked better in the long tail phase inverter position, but then the amp would not have enough sensitivity for the matching Troughline preamp which essentially has no line stage and just a 2 stage EF86 phono preamp. If you are looking for a high mu tube and want to use something else as the 6SL7 tube or if you look for an Octal based alternative to a 12AX7, the 6SC7 might be the choice for you. NEW Shuguang Chinese 6N9P 6SL7 6H9C Vacuum Tube 2PCS - Direct Replacement of 6SL7 FREE SHIPPING WORLDWIDE DESCRIPTIONThe Shuguang Chinese 6N9P is direct replacement of 6SL7. I think that they sound better. ECC35 has another operating point, but it will fit in normal 6SL7 circuits, since this is a high gain tube and auto bias is functioning very nice with high gain tubes. 6SN7 is a dual triode vacuum tube with an 8-pin octal base. Worldwide shipping. 6AV6,6SQ7, and 12AX7 triodes. The original 7025 tube was a 12AX7 that was tested and selected for the lowest noise and microphonics for use in the critical first preamp stages of amplifiers where noise and microphonics. The Optimised SRPP Amp (Part 1) By Merlin Blencowe Some deceptively-simple circuits, explained for the audio amateur. 13 ruger9 5 years ago. A low-noise, low-microphony 5751, 12AX7, or 7025 is also usable, though they will have more voltage gain and will change the sound of the amp considerably. I have not tried any other types. They are good quality and found in many Chinese amps and preamps. When you look into the 6SL7, the high mu sister of the 6SL7, you will discover it has two sets of curves, low current for RIAA pre-amp use, high current for power tube use. 12V they don't sound as intended because you are out of the optimal operating. The original 7025 tube was a 12AX7 that was tested and selected for the lowest noise and microphonics for use in the critical first preamp stages of amplifiers where noise and microphonics. The basis for this amp started out as a post in a thread on the DIY Audio Projects Forum site. 6SL7 Power Tubes 2, 25L6. I have also used hi-mu triodes, but 6N2P-EV tubes with practically similar topology and the results are good. Bonne Terre, MO 63628 [email protected] hp = Heptode Unit. That is why the RCA 12AX7 black plate are expensive. I think a 6SL7 be a good sub for the 12AX7 with the same 300 ma heater current. 12AX7: 12DW7: 5751: 7247: 6DJ8: 6267/EF86: 6922/7308: 6SN7/5692: 6SL7/5691: Store Hours Monday - Friday 9 am - 5 pm Central Time : SND Tube Sales. The above SPICE models for various valves and most of these models are for use with PSpice from Orcad. As well it offered more gain. Sophia Electric™ 12AU7 vs. 6K, and you may occasionally see very large value resistors, such as 470K or greater, in. This tube performs 4. " VT-229 RCA - Black Base, Black Round Plates, graphite coating - If your system sounds a little too analytical, harsh or electronic this may be your favorite tube. There are many versions of the 12AX7 tube and many brands. So that may be a consideration unless you are building from scratch and take that into consideration. I think that they sound better. 83 (2 new offers). 5 watts plate dissipation, 450VDC Plate Voltage rating, electrically similar to 6CG7) (6SN7GTB is a controlled warm-up version of 6SN7GTA; 11 second heater warmup, 450VDC Plate Voltage rating. Great tubes with great sound. 6SN7/6SL7 tubes are not in anyway compatible with 6AS7/6080/6H13C tubes. How to use 6N1P and 6N2P Russian tube. INTRODUCTION. Same result , in fact I recently used a 7F7 to drive a small 12B4a SET amp. Octal-type dual triodes are available that perform similarly to the 12AX7 and the 12AU7. Very consistently made tube. But one needs to keep in mind that in low level use the 12AX7 is superior regarding hum (from heater) and noise, simply because of later design, also especially for audio use. Heard a few folks mention that they find 6922s too "clinical. If Ebb = 400 volts then the grid voltage of the inverter and the plate voltage of the amplifier should be about 100 volts. For example, don't expect a 12AX7 based Cathode Follower to drive a 600 ohm load to 10 volt peaks just because it has a 600 ohm output impedance. care to elaborate about that adapter??…6SL7 is indeed dual triode and octal. Ya, my B-15N has 6SL7's and I love it, yet my SVT and V4B have 12ax7's and I love them, too. ECC83S is 12AX7 high gain pre-amplifying double triode. The "7" in the leading digit. This includes such classics as 6L6, 6V6, 6550, 6CA7, 12AX7, 12AU7, 6SN7, 6SL7, 12BH7, 12AY7, etc. 12AU7 is double triode small size novel tube, it is used as inverter drive push-pull amplifier in amplifying circuit. Heard a few folks mention that they find 6922s too "clinical. "In addition to the stock driver, you can also use a NOS 6SN7, 6SL7, 6188, 6SU7GTY. Richie Mike: The RFT 12AX7 removes the harshness that I was experiencing from the amp (Dr Z Maz Jr). A: 6SN7 or 6SL7,ECC32,ECC33,ECC35,5691,6592,B65. Title: Unknown Author: Unknown Created Date: 11/16/1997 2:31:22 AM. And the 6SN7 should sub for the 12AU7 if I am correct. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. I've been living with a set of PSVANE 12AX7′s for a few weeks now and so far, these are great sounding tubes. You have given me something to ponder and I am probably a little closer to trying it. Guaranteed by Wed, Feb 12. This is a real 6973, not a rebrand of a "close" tube. Well, seems 'WE replica' has been a theme for tube manufacturers from China. NOS 6SL7 are quite plentiful and cheaper than a NOS 12AX7. These preamp tubes are getting more expensive and harder to find. Tube Interchangability Reference. ANOS RAYTHEON LONG BLACK PLATE 12AX7 $35. The Marshall/Fender phase inverter is commonly known as a "long-tail pair", or "Schmitt" type phase inverter, or phase splitter (actually, the original Schmitt inverter was a differential pair with a large "tail" resistor; the "standard" guitar amplifier phase inverter is a self-biased version of this circuit that works better with positive-only power supplies and. But the 6SN7GT is arguably the best general-purpose audio triode. And 5751s work pretty well in many non-phono applications as a substitute for a 12AX7. This is the driver. I select a 12AX7 the databook said that µ = 100 and Ra= 80K ohm I made R = RAK = RK = 3. It is frequently confused with other, vaguely similar-looking circuits,. Since 1996, Tube World, Inc. When you look into the 6SL7, the high mu sister of the 6SL7, you will discover it has two sets of curves, low current for RIAA pre-amp use, high current for power tube use. p = Pentode Unit. The circuit looks fully OK to me. similar to 5751 gain. As well it offered more gain. IIRC, the heater wires inside the cathode are twisted to help cancel hum fields. They were very inexpensive. 75 Tung-Sol FOUR QUAD Factory Platinum Matched GOLD 6SL7 6SL7GT GOLD Tubes. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for. Audiophiles may have their own favorite dual triodes, ranging from exotic European types like the ECC40 to the rugged industrial types like the 5687. Wholesale & retail trade. Ham Call: WB0SND. The "7" in the leading digit. But one needs to keep in mind that in low level use the 12AX7 is superior regarding hum (from heater) and noise, simply because of later design, also especially for audio use. And 6 volts is correct. Michael Marx 105 N. It is the responsibility of the customer to consult with the equipment manufacturer with regards to proper tube and parts replacement and recommended / proper biasing procedures. 3 K ohm and find the RL is 123 K ohm by F 45, 120 K is practical. The type 5691 Tube is a "premium" version of the type 6SL7. A 6SN7 won't die with 600V on it and a 12AX7 will be a little plasma ball. Very smooth and warm sound. I've decided to relaunch my most popular seller with many upgrades while still keeping the price under $1K. interesting!. I select a 12AX7 the databook said that µ = 100 and Ra= 80K ohm I made R = RAK = RK = 3. Over the past several months, I have been working on a new 2015 Musica Bella LeAnna preamp circuit. Eli Duttman has said that the 6SL7 is very close to 12AX7 except for the mu. I've done this a hundred times ,I even use 12ax7,12au7. Can I solicit some opinions from anyone who has tried any octal preamp tubes? The 6SL7 is listed in the RCA tube manual as high Mu, so that's what I was going on. The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. t = Triode Unit. The power tube is a cathode biased class A 6V6GT. 6SN7 is a dual triode vacuum tube with an 8-pin octal base. ECC81 is 12AT7 medium gain pre-amplifying double triode. Now we have: µ = 100 R A = 80K ohm. While many lovers of vacuum tubes enjoy the hunt for NOS (new old stock) tubes, great deals on NOS tubes are few and far inbetween. There seem to be a bazillion. Good for phase inverters or reverb drivers. The key point I hope that I have made is that the SRPP holds two sub-circuits and that one of the two, the impedance-multiplier circuit, is quite interesting, if for no other reason that so few knew it was there in the first place. For more information on 6SL7 vacuum tubes including pinouts, ratings, application and possible substitutions visit 6SL7 in Duncan Amps , and 6SL7 in The Tube Directory. 13 (46%) Tung Sol 6V6GT Platinum Matched Duet Tubes. Now we have: µ = 100 R A = 80K ohm. You also have know what the filament voltage is as well as the current. Hi-end phono preamplifier (soon available in kit or assembled)Nov 27 st, 2008. Diode Rectification. DATE CODES FOR RCA-MADE TUBES Ludwell Sibley There is a sort of fascination with the date codes that are found on tubes. The 6SL7 would be used in similar applications to the 12AX7 - or to those in the EU, the ECC83 - as phase splitters, low-level preamp stages, etc. Cryo 12AX7 / ECC83 Cryo 12AY7 Cryo 12BH7 / 6350 Cryo 12DW7 / ECC832 Cryo 5751 Cryo 6922 / 6DJ8 / E88CC / 6N1P Cryo 6C45PI Cryo 6CG7 / 6FQ7 Cryo 6H6P / ECC99 / E182CC Cryo 6N23P-EV Cryo 6N30P Cryo 6SL7GT / 5691 Cryo 6SN7 / 5692 / 6H8C Cryo EF86 Super Cryo Preamp Tubes Cryo Power Tubes-> Cryo Rectifier Tubes-> NOS 12AT7 NOS 12AU7 NOS 12AX7 NOS 12BH7. net/Equiv_similar. This is a long plate valve so has a very rich tone. 13 ruger9 5 years ago. It is a single ended class A amplifier and features a Custom All Tube Guitar Amp Cascode 12ax7 Push Pull 6v6. NOS 6SL7 are quite plentiful and cheaper than a NOS 12AX7. A good example of the remote-cutoff pentode is the type 39/44, which uses a 5-pin base and a grid cap, so it is interesting to experiment with. with an adapter with no problem in my socket modified Dyna Pass II. Among the 3, there's no exact match the way there is with 6SF5 or 6SQ7 and 12AX7. This tube provides a fat and smooth tone, overall more musical than the newer 12AX7 (kinda like the difference between a 6V6 and an EL84, to give some perspective). p = Pentode Unit. It has the same pinout as the 12AX7 but is not electrically compatible and is taller. The nine-pin 12AX7 has a amplification factor of 100. The MK1 B1 Chassis 12AX7 Power Tubes 2, 25L6. 6AV6,6SQ7, and 12AX7 triodes. Read More $24. The two front gain tubes in my Primaluna pr. Tubes in the "Tube" column are directly replaceable with tubes in the "Replacement" column. Here is a list of all 9-pin / Noval tubes and 8-pin / Octal tubes with compatible pinouts. ? by hilldweller » Sun Nov 24, 2013 7:24 pm Yea, I thought a bigger tube with bigger plate surface would be a better choice and that is what I will probably use. 2 excellent strong 1969 mullard 12au7a / 12au7 tubes # 727. I have also messed around with similar high mu valves , in my case I compared 7F7 (loctal 6SL7) to 6GK5 , ECC83 and 5755. Related products. It is a dependable, high mu double triode with reduced gain and clearer, more articulated tone than a higher gain ECC83. The 6EU7 is a low-hum, nine-pin, high-μ (100) dual triode with a different pinout than that of the 12AX7. The 45-triode sound signature is even more pronounce, liquid, and silky. DATE CODES FOR RCA-MADE TUBES Ludwell Sibley There is a sort of fascination with the date codes that are found on tubes. 6N1P and 6N2P are the most popular small signal twin triodes in Russian audio. Bonne Terre, MO 63628 [email protected] As a popular choice for guitar tube amplifiers, its ongoing use in such equipment makes it one of the few small-signal vacuum tubes in continuous production since it was introduced. Once thing interesting about Loktal's. This tube performs 4. You really can't use a 6SN7's in circuits designed for 12AX7's because the tubes do not have the same electrical characteristics. The octal preamp tubes I am familar with were used in tweed Fenders and many other vintage tube amps. 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. This tube was first produced by RCA which called the 5691 one of it's "SPECIAL RED" tubes due to the red colored low. Pricing & History. The 12AX7 is also used in many audio preamps and in guitar effects pedals. For example, a local audio shop sells 12AX7 to 6SL7, 6CG7 to 6SN7, and 12AU7 to 6SN7 adapters and I bought four of each. The classic information, on early RCA tubes in particular, is Bro. Although both are dual triode tubes, the latter is a power triode type and the circuitry required will have very different requirements than 6SN7/6SL7 tubes. TJ Music Full Music Vacuum Tubes Treasure From China Swapping the EH 12AX7 for a very expensive Telefunken just muddied up the midrange and switching to a Mullard slowed down the presentation and increased background noise. Title: 6SL7GT 12SL7GT Author: General Electric Subject: JA-FP-2000-12-26 Created Date: 12/26/2000 8:39:03 PM. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. JJ Electronic ECC83MG - 12AX7 Factory Data Sheet: ECC83MG Our observations: Another 12AX7 variant from JJ. 12AT7 - ECC81 Another popular twin triode. This tube was first produced by RCA which called the 5691 one of it's "SPECIAL RED" tubes due to the red colored low. I am interested in short glass version only please. It was released for public sale under the 12AX7 identifier on September 15, 1947. So it's very much the circuit as JGR says. Here is the page: I had an octal pre wired in parallel to the 12AX7 V1 of. For example, don't expect a 12AX7 based Cathode Follower to drive a 600 ohm load to 10 volt peaks just because it has a 600 ohm output impedance. 59) Posted by ahendler on 2011-07-26, 21:09:04 (99. 12at7,12bz7 & 6dj8/ecc88 etc. I've decided to relaunch my most popular seller with many upgrades while still keeping the price under $1K. I select a 12AX7 the databook said that µ = 100 and Ra= 80K ohm I made R = RAK = RK = 3. A 12AU7 would have worked better in the long tail phase inverter position, but then the amp would not have enough sensitivity for the matching Troughline preamp which essentially has no line stage and just a 2 stage EF86 phono preamp. It is a premium quality 12AU7 tube built to match the performance of the military/industrial original GE 6189 tube. Can I solicit some opinions from anyone who has tried any octal preamp tubes? The 6SJ7 is a pentode preamp tube that was used in the first Fender Champ. These preamp tubes are getting more expensive and harder to find. Those old guys knew a thing or two about amplifiers. 12bh7/ecc99 The 12BH7 is a medium gain dual triode used in hi-fi amplifiers, pro audio equipment and some guitar amplifier circuits. FWIW: The 6SL7 which has the exact same pinout as the 6SN7 has about the same gain as a 5751. Ya, my B-15N has 6SL7's and I love it, yet my SVT and V4B have 12ax7's and I love them, too. 5 out of 5 stars. You guys rock. The circuit looks fully OK to me. These adapters allow you to use a 6SN7 as a replacement for a 12AU7, or a 6SL7 as a replacement for a 12AX7. There seem to be a bazillion. For 9-Pin power tubes like the EL84 the plate is pin 7 and the cathode is pin 3. For more information on 6SL7 vacuum tubes including pinouts, ratings, application and possible substitutions visit 6SL7 in Duncan Amps , and 6SL7 in The Tube Directory. The 7025 is a 12AX7 with hum reduced heaters, for example. While many lovers of vacuum tubes enjoy the hunt for NOS (new old stock) tubes, great deals on NOS tubes are few and far inbetween. A: 6SN7 or 6SL7,ECC32,ECC33,ECC35,5691,6592,B65. Home › Preamp Tubes. The 6SL7 is very much like a 12AX7, but it's gain rating is 70 compared to 100. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. Northern Electric 6SL7. In my headphone amp, I'm using a 2c51 adapter with a WE 2c51 driver and two TS 5998 output tubes. I love the rich tone of the octal tubes like the 6SL7 over that of the 9-pin tubes as the 12AX7. For octal (8-pin) tubes the plate is pin 3 and the cathode is pin 8. 6922 Gold Pin (also E88CC) Premium gold pin version of 6922. The 5751 version of the 12AXY tube is a military version that is rugged and has a lower Gain of 70. 6SL7/5691/6SU7. Audiophiles may have their own favorite dual triodes, ranging from exotic European types like the ECC40 to the rugged industrial types like the 5687. 6922 vs 12ax7 - "clinical"? Discussion in 'Tube Audio' started by bjlefebvre, Sep 26, 2016. The power tube is a cathode biased class A 6V6GT. These are sweet and rare versions of the 6SL7, and are plug and play compatible with any 6SL7 or 5691 type tube. The cathode resistor in a typical triode preamp is bypassed with a large capacitor to eliminate a form of negative. Tube 6SL7 or Röhre 6SL7 ID2112, Double Triode, Octal (Int. 137: RE: TJ / Sophia 6SN7 & 6SL7 (8. Michael Marx 105 N. 3V in the same circuit and the power transformer has adequate current for either. Again the power section is flawed in these amps and uses a similar configuration as the octal models. 12AX7: 12DW7: 5751: 7247: 6DJ8: 6267/EF86: 6922/7308: 6SN7/5692: 6SL7/5691: Store Hours Monday - Friday 9 am - 5 pm Central Time : SND Tube Sales. That said, many popular audio tubes are tested for mutual conductance in the upper panel Dyna-Jet sockets. I have been using a 50s Bogen head with 2 6v6, 1 6SL7, 1 6SC7, and one 6SJ7. A 12AU7 would have worked better in the long tail phase inverter position, but then the amp would not have enough sensitivity for the matching Troughline preamp which essentially has no line stage and just a 2 stage EF86 phono preamp. Otherwise a bad sample sounds just as clinical as a bad 12AX7. These are sweet and rare versions of the 6SL7, and are plug and play compatible with any 6SL7 or 5691 type tube. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. "In addition to the stock driver, you can also use a NOS 6SN7, 6SL7, 6188, 6SU7GTY. output voltage = 5V, amplification gain = 10(line stage) - phono EQ : MM, RIAA curve - size :see more. 32 dB at midrange), and the LF roll-off is nearly identical. The great thing about the 6SL7 is that NOS tubes are readily available at affordable prices. This tube provides a fat and smooth tone, overall more musical than the newer 12AX7 (kinda like the difference between a 6V6 and an EL84, to give some perspective). similar to 5751 gain. Tube Testing Equipment. Some tweaks could be made to compensate for that if the 6SL7 loses too much HF. You could also use a type 78 with a six-pin socket and grid cap, or the identical 6K7 with an octal base, or the later 6SK7. To start viewing messages, select the forum that you want to visit from the selection below. Tube Depot carries a selection of 6SL7 Pre Amp Vacuum Tubes. In my headphone amp, I'm using a 2c51 adapter with a WE 2c51 driver and two TS 5998 output tubes. any thoughts? Thank you. Hand built 12AX7-based vacuum tube stereo preamplifier with tube power supply. Flying Leads Plug&Play CV4034 - Premium 12AU7 ECC82 E82CC ECC802S 5814 6189 6680 CV491 CV4003 CV4113 CV4122 F6067 B749 M8136 13D5 7316 type. The 6SN7, is so close to a 12AU7 that I would say any sort of self split 12AU7 design would work identically with a 6SN7. Once thing interesting about Loktal's. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. This should be the last installment on the SRPP and SRPP+ circuits—for a few months at least. The "premium" qualities of the 5692 include a long-life cathode rated at 10,000 hours along with extra support rods and mica spacers to eliminate microphonics. Tim's 12AU7 Tube Preamplifier Schematic. Same result , in fact I recently used a 7F7 to drive a small 12B4a SET amp. has been a leader in providing the highest quality new old stock vacuum tubes. Tung-Sol 6V6GTs are the holy grail for players who crave the sound of a Fender Princeton, Deluxe or Champ, or those who revere the tone of the earliest Ampeg Jet and Rocket. Out of curiousity I built an octal to noval converter, and plugged in an ECC83 where the 6SL7 input tube normally goes, as they are very roughly equivalent tubes. You really can't use a 6SN7's in circuits designed for 12AX7's because the tubes do not have the same electrical characteristics. I have tried using a 6sl7 pushing 1/2 of a 6Sl7 to a 1 meg volume and back to the second 1/2 6SL7 and I really like the initial tone. Interested in this item? Contact right sound now! Forum Messages. The 7F7 is identical to the 6SL7. d = Diode Unit. The octal preamp tubes I am familar with were used in tweed Fenders and many other vintage tube amps. Even more impressive is the fantastic breakup / drive of this tube. Worldwide shipping. Once thing interesting about Loktal's. Very consistently made tube. Ham Call: WB0SND. The MK1 B1 Chassis 12AX7 Power Tubes 2, 25L6. A completely hand-wired, true tube preamplifier using full tube rectification, tube regulation and point to point wiring. A favorite is the 50's "Chrome Dome", black plate w/square getter. Electronic Schematics Electronic Kits Electronic Engineering Electrical Engineering Dc Circuit Circuit Diagram Valve Amplifier Hobby Electronics Headphone Amp. This tube was first produced by RCA which called the 5691 one of it's "SPECIAL RED" tubes due to the red colored low. Although they've been going up in the last couple of years. Its large octal format is more rugged and less prone to intermittent pin connections than miniature type. All That Jazz ( A Thread for the Seriously Addicted ). Good post, Edmond. (Same problem is with USA made 12AX7 NOS, many are below average nowadays, and they don't get better from storage, and burn in won't do the magic trick). It has the same pinout as the 12AX7 but a gain of 20 instead of 100, higher transconductance, and it can provide more plate current than a 12AX7. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. The nine-pin 12AX7 has a amplification factor of 100. Preamp tubes take the small signal from your pickup and amplify it to "line level. Download, Listen and View free SRPP vs cathode follower, right pre out tubes for you 12AU7 6SN7, no good 12AX7 6SL7 12AT7 진공관앰프 MP3, Video and Lyrics. The -3 dB HF roll-off is higher for the 12AX7 due to its lower input capacitance. Radio tubes are valves. This is a long one folks. The 6SN7 is basically two 6J5 triodes in one envelope. If you want to get an idea of the gain level of the 6SL7, try a 12AY7 or 12AT7 in there but again, I don't know if anything was done to your circuit to tame the 12AX7 (if anything) either way, it won't hurt the amp to try a lower gain, nine. For those 6sl7/6sn7 users,don't be afraid to swap 6sl7/ 6sn7 or vise versa,or even 6sl7 on one channel and 12ax7/ 6dj8 12au7 on the other channel. ****OUT OF PRODUCTION***NLA****. 13 (46%) Tung Sol 6V6GT Platinum Matched Duet Tubes. Tube Testing Equipment. 6AV6,6SQ7, and 12AX7 triodes. It is a premium quality 12AU7 tube built to match the performance of the military/industrial original GE 6189 tube. To make things easier to find, I've listed all the equivalents from the header, so some files will be duplicated. Cryogenic Treating. They are good quality and found in many Chinese amps and preamps. We need a mention the fourth member of the Sovtek 12AX7 family. Leak 20 - Mullard style circuit using 3 x 12AX7. According to us, must a tube which can be. Very consistently made tube. The 12ax7 is a a more aggressive sometimes harsh tube that though ubiquitous, isn't a favorite of mine. The -3 dB HF roll-off is higher for the 12AX7 due to its lower input capacitance. Eli Duttman has said that the 6SL7 is very close to 12AX7 except for the mu. So that may be a consideration unless you are building from scratch and take that into consideration. Beam power amplifier used in vintage Gretsch and Magnatone amplifiers. B: ECC83 or 12AX7 12AU7 12AT7 ECC81 ECC82 7025 CV4003 CV4004 5751 5814 6021. Just a preamp and I have it running into Fender PA with 2 5881 and a 12AX7 like a brownface 6G6B. Title: 6SL7GT 12SL7GT Author: General Electric Subject: JA-FP-2000-12-26 Created Date: 12/26/2000 8:39:03 PM. If you're looking for great-sounding vacuum tubes, fast shipping and superior customer service, then you have come to the right place. I found some recently but they were metal (dont know if there is a difference in tone). 6SN7/6SL7 tubes are not in anyway compatible with 6AS7/6080/6H13C tubes. 6SL7 / 5691: 70: 44k: Similar to 12ax7; fuller sounding, but noisier: 6SN7 / 5692: 20: 7. Going on to Loktal tubes we find the 7B4,and 7B6 triodes identical with the 6AV6. Although both are dual triode tubes, the latter is a power triode type and the circuitry required will have very different requirements than 6SN7/6SL7 tubes. And even in 2018, while I write this, it is not the tube everybody is desperately looking for. IIRC, the heater wires inside the cathode are twisted to help cancel hum fields. has been a leader in providing the highest quality new old stock vacuum tubes. Wholesale & retail trade. When you look into the 6SL7, the high mu sister of the 6SL7, you will discover it has two sets of curves, low current for RIAA pre-amp use, high current for power tube use. ****OUT OF PRODUCTION***NLA****. The 12AX7 has the highest gain at 100, the 12AT7 is lightly lower and the 12AU7 is the lowest gain of the group. There may be similar for the 12AU7 12AT7 and maybe the 6SN7. The matched quad of the Mullard CV491 Long Plates cost me a small fortune. Positive Feedback ISSUE 76 november/december 2014. 6922 vs 12ax7 - "clinical"? Discussion in 'Tube Audio' started by bjlefebvre, Sep 26, 2016. Works well with solid state and tube amplifiers alike. it won't hurt your preamp. Full and chimey mids, a tight bottom end and greatly reduced hum and noise characterize this tube. The 6SN7 is a medium gain tube (similar to a 12AU7) while the 12AX7 is high gain. Octal-type dual triodes are available that perform similarly to the 12AX7 and the 12AU7. Any 12AX7 or 7025 is usable here-it need not be low-noise or low-hum, nor does it need to be tested for microphony. Right now in fact I'm listening through my power amp with a 6DJ8 frontend (a Tesla late '70's production PCC88 actually), and the amp sounds superb, really lush and wonderful with excellent depth and. Here is the page: I had an octal pre wired in parallel to the 12AX7 V1 of. The cascode is a means of using a pair of triodes to achieve very high levels of gain and input sensitivity from a single stage. The preamp is an octal 6SL7 (ancestor of the 12AX7). Humble Beginnings. How to use 6N1P and 6N2P Russian tube. 18watt Technical Discussion. The key point I hope that I have made is that the SRPP holds two sub-circuits and that one of the two, the impedance-multiplier circuit, is quite interesting, if for no other reason that so few knew it was there in the first place. Originally released in 1939 it was officially registered in 1941 by RCA and Sylvania as the glass-cased 6SN7GT, originally listed on page 235 of RCA's 1940 RC-14 Receiving Tube Manual, in the. I select a 12AX7 the databook said that µ = 100 and Ra= 80K ohm I made R = RAK = RK = 3. The 12AX7 will have a bit more gain (34 vs. The 12AT7 seems close, at a mu of 60. BRENT JESSEE RECORDING & SUPPLY, INC. Very consistently made tube. ECC83S is 12AX7 high gain pre-amplifying double triode. The New York Audio Show 2015 was a more intimate affair than previous, held outside the five boroughs - at the Hilton Westchester in Ryebrook NY - and attended primarily by diehard audio enthusiasts willing to brave the travel outside the City proper. With the 12AX7 being such a popular tube in. 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. [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. In most applications, but not all, RCA 12AX7 black plate are fantastic. 12V they don't sound as intended because you are out of the optimal operating. Going on to Loktal tubes we find the 7B4,and 7B6 triodes identical with the 6AV6. has less gain than a 12ax7. Browse products from the Vacuum Tubes category - listing products sorted by popular, Made in Russia. Division St. The 5751 is the nine pin equivalent of the 6SL7. d = Diode Unit. Electronic Schematics Electronic Kits Electronic Engineering Electrical Engineering Dc Circuit Circuit Diagram Valve Amplifier Hobby Electronics Headphone Amp. High gain, super low microphonics, and superb linearity with a three dimensional tone. The 6SJ7 tested was very close to specifications, despite its age. Mullard 12AX7 $19. That is why the RCA 12AX7 black plate are expensive. 12AX7, 2-6BM8, 5Y3 GA-6: 12AY7, 6SL7, 2-6V6, 5Y3 GA-6 Lancer: 2-12AX7, 2-6V6, 5Y3 (identical to GA-14 Titan except for 12" speaker) GA-5 Skylark: 12AX7, 6V6, 5Y3. The Best 6SL7-type tubes ever made? An Update If this is your first visit, be sure to check out the FAQ by clicking the link above. 6922 vs 12ax7 - "clinical"? Discussion in 'Tube Audio' started by bjlefebvre, Sep 26, 2016. 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. For example, don't expect a 12AX7 based Cathode Follower to drive a 600 ohm load to 10 volt peaks just because it has a 600 ohm output impedance. 12AX7 - ECC83 B9A indirectly heated twin triode is one of the most popular pre amp valves around. Grading and Matching. it won't hurt your preamp. The SRPP is a most enigmatic circuit (fig. The two front gain tubes in my Primaluna pr. CV569 Mullard Military designation for ECC35. Tung-Sol SINGLE Factory Tested 6SN7 6SN7GTB Tube $ 23. Some tweaks could be made to compensate for that if the 6SL7 loses too much HF. Tubes in the "Tube" column are directly replaceable with tubes in the "Replacement" column. 3V in the same circuit and the power transformer has adequate current for either. The classic information, on early RCA tubes in particular, is Bro. Very smooth and warm sound. Features (2) 12AX7's, (1) 5AR4 rectifier, and (2) OD3 Regulator tubes. I recently got a box of NOS tubes, among them several Mullard and Telefunken ECC83. anything but guitar amps. A robustly built stereo Single-Ended amplifier utilizing the KT88 Pentode in either Triode or Ultra-Linear mode producing up to 18 watts per. Get a low price and free shipping on thousands of items. Re: 6SL7 vs 12AX7 Whats the dif. The 6EU7 is a low-hum, nine-pin, high-μ (100) dual triode with a different pinout than that of the 12AX7. 6SN7 / 5692 Tube List. Can you substitute a 12bh7 vacuum tube for a 12ax7 or 12au7 or 12at7 or 12ay7? Examples: 3A5, 6J6, 6SN7/6SL7, 12AU7/12AX7, ECC32, ECC82. Just a preamp and I have it running into Fender PA with 2 5881 and a 12AX7 like a brownface 6G6B. Patrick Dowd's writeup*. The bigger issue is the heaters. In most applications, but not all, RCA 12AX7 black plate are fantastic. New production & NOS pre amp compatible tubes from Tung-Sol, Sovtek & other various brands! Mullard 12AX7 / ECC83 New Production Preamp Vacuum Tube. These are sweet and rare versions of the 6SL7, and are plug and play compatible with any 6SL7 or 5691 type tube. I quess you will only build the fixed RIAA, not all those switchable alternatives ?. It's hard to compare directly, since those two tubes are not direct swappable. 12au7/ecc82 The 12AU7 is a low gain dual triode commonly used in audio amplifiers and hi-fi circuits. 雖然有人認為 6sl7 / 6sn7 的聲音,足以勝過當紅的 12ax7 / 12au7, 而且大腳、有底座的管子比較堅固耐用,較大的管身亮起來也比較美麗, 但除了 diy,目前單純使用 6sl7 / 6sn7 設計的前級並不多。 為什麼 ?! 1. Some tweaks could be made to compensate for that if the 6SL7 loses too much HF. DATE CODES FOR RCA-MADE TUBES Ludwell Sibley There is a sort of fascination with the date codes that are found on tubes. But this one is not an exact replica of Western Electric tube; instead it is a 'plus' version with slightly different structure - for example, getter for More Info ». 13 (46%) Tung Sol 6V6GT Platinum Matched Duet Tubes. Eli Duttman has said that the 6SL7 is very close to 12AX7 except for the mu. 174) I have the Sophia 6sn7's and no longer use them in my amp. The most popular of this family is the ECC83. Im thinking of getting at least one or two Groove Tubes Substitube. This is the European part number and the American pert number is the 12AX7. like microphonic pickup may sound good, but feedback easy. Preamp Tubes - 12AX7 / ECC83 / CV4004 / 5751 Tube Basics and FAQ. The 6SN7, is so close to a 12AU7 that I would say any sort of self split 12AU7 design would work identically with a 6SN7. Mullard 12AX7 is an excellent all rounder, Mullard 12AX7 is one of the top choices for. it won't hurt your preamp. The first EH 12AX7's were the exact same plate as the LPS which was 5/8" long. 75 Tung-Sol FOUR QUAD Factory Platinum Matched GOLD 6SL7 6SL7GT GOLD Tubes. 12AX7 Williamson First stage alone. Now we have: µ = 100 R A = 80K ohm. They were very inexpensive. 3V in the same circuit and the power transformer has adequate current for either. The new solid plate, triple getter Ruby KT88V-STR has excellent reliability, focused soundstage, and a wide linear frequency response. Though 6SL7 is similar to ECC83, which NOS version is very expensive, and 6SL7 is even older. At zero bias, a 12AX7 may do 4mA Ia, while a 6SN7 will hum along happily at 10mA. The Long-Tail Pair. Since 1996, Tube World, Inc. The 7C6 triode is also similar. Tung-Sol 12AX7 New Production Preamp Vacuum Tube. It's hard to compare directly, since those two tubes are not direct swappable. This Chinese 6SL7 tube type is commonly called a 6N9P tube in China. Octal, IO) K8A, USA 1935 and Audio Frequency shown. 137: RE: TJ / Sophia 6SN7 & 6SL7 (8. Most SPICE model links are to Dave Cigna's stash of SPICE models provided by Francesco Piazza- these are marked DC. New production & NOS pre amp compatible tubes from Tung-Sol, Sovtek & other various brands!. Although miniature vacuum tubes (like the 12AX7) later became more popular in consumer equipment because of their smaller physical size, the 6SL7GT remained a favorite of. t = Triode Unit. Its large octal format is more rugged and less prone to intermittent pin connections than miniature type. - tubes included : 3 6SN7, 1 6SL7, 1 12AX7, 1 6X5 - max. 6SL7 Tubes Below is our current selection of 6SL7 audio tubes. similar to 5751 gain. Feedback received via email: "Hi Rachel, I received the 12AX7LS super tubes and their performance is super! Put the new tubes in and turn on, first 10 mins, comparing to Psvane 12AX7-TII…the new super tube has lower noise floor, sound is more dense and transparent, bass is deeper and better bass layering. CV569 Mullard Military designation for ECC35. This is rare one. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. FLUXION BL-2A tube preamplifier with MM phono EQ, upgraded version. We will take a look at why you might, or might not want to swap out the different types of tubes. The "premium" qualities of the 5692 include a long-life cathode rated at 10,000 hours along with extra support rods and mica spacers to eliminate microphonics. That is why the RCA 12AX7 black plate are expensive. If you can't find any, check for the 12V heater cousin. There seem to be a bazillion. NEW Shuguang Chinese 6N9P 6SL7 6H9C Vacuum Tube 2PCS - Direct Replacement of 6SL7 FREE SHIPPING WORLDWIDE DESCRIPTIONThe Shuguang Chinese 6N9P is direct replacement of 6SL7. It is the Sovtek 12AX7LPS. The most popular of this family is the ECC83. But one needs to keep in mind that in low level use the 12AX7 is superior regarding hum (from heater) and noise, simply because of later design, also especially for audio use. The 45-triode sound signature is even more pronounce, liquid, and silky. These are sweet and rare versions of the 6SL7, and are plug and play compatible with any 6SL7 or 5691 type tube. ECC35 has another operating point, but it will fit in normal 6SL7 circuits, since this is a high gain tube and auto bias is functioning very nice with high gain tubes. Very consistently made tube. Then because the microphonics were high they changed to a short plate that is 1/2" and this helped to quiet them down some. The matched quad of the Mullard CV491 Long Plates cost me a small fortune. The 7K7 triode is identical to the 6AT6/6Q7/6SL7 triodes. Sophia Electric™ 12AU7 vs. The above SPICE models for various valves and most of these models are for use with PSpice from Orcad. Richie Mike: The RFT 12AX7 removes the harshness that I was experiencing from the amp (Dr Z Maz Jr). Original 400mA filament current tube. Variants include: 7062, E180CC, E81CC, CV6091, 12AT7WA, 6060, 6679, 7492, A2900. 12V they don't sound as intended because you are out of the optimal operating. has been a leader in providing the highest quality new old stock vacuum tubes. For taming a bright system the RCA 6SL7 are recommended. Why We Don't Sell Certain Brands. Tavish Design Vintage 6SL7 Phono Stage. The ECC83 MG is a "Mid Gain" 12AX7 type tube. The 5751 is the nine pin equivalent of the 6SL7. Ending Friday at 6:00PM PST. The JJ 5751 is a drop-in replacement for any 12AX7 / ECC83 tube. So each time I can find some NOS 6SN7, the same story repeats: I hope for 9mA or above, and what I get is 8mA or below, and. Telefunken & others such as Raytheon 12ax7 black plate are not even close in performance compared to the RCA 12AX7 black plate. The most popular of this family is the ECC83. ANOS RAYTHEON LONG BLACK PLATE 12AX7 $35. The document has moved here. If you can't find any, check for the 12V heater cousin. Lower gain, with more drive than a 12AX7, these feature in many HiFi pre amps, power amps and guitar amps. The Best 6SL7-type tubes ever made? An Update If this is your first visit, be sure to check out the FAQ by clicking the link above. Otherwise DC on the heaters gets rid of this (assuming reasonably well filtered DC). For 9-Pin preamp tubes like the 12AX7 the plates are pins 1 and 6 and the cathodes are pins 3 and 8 (measure between pins 1 and 3 for A; 6 and 8 for B). NEW Shuguang Chinese 6N9P 6SL7 6H9C Vacuum Tube 2PCS - Direct Replacement of 6SL7 FREE SHIPPING WORLDWIDE DESCRIPTIONThe Shuguang Chinese 6N9P is direct replacement of 6SL7. 6N1P and 6N2P are the most popular small signal twin triodes in Russian audio. Vo = 10 v RMS. And 6 volts is correct. Just a preamp and I have it running into Fender PA with 2 5881 and a 12AX7 like a brownface 6G6B. Why We Don't Sell Certain Brands. But one needs to keep in mind that in low level use the 12AX7 is superior regarding hum (from heater) and noise, simply because of later design, also especially for audio use. The 12AT7 is another very well known tube among guitar players. The tube contains a single triode system. Its mu of 20 is a nice. (The 12AX7 has all the same less the shield, except the Chinese put in a shield without connecting it to anything, so you decide if that makes it a 12AX8. It is a premium quality 12AU7 tube built to match the performance of the military/industrial original GE 6189 tube. I have a 6B4G SET amp with 6SL7 input and 6SL7 driver tubes. I've decided to relaunch my most popular seller with many upgrades while still keeping the price under $1K. Vo = 10 v RMS. The adapter would have to drop down the 12 volt filament to 6 volts for that to work. The new solid plate, triple getter Ruby KT88V-STR has excellent reliability, focused soundstage, and a wide linear frequency response. This Chinese 6SL7 tube type is commonly called a 6N9P tube in China. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. 12AT7 - ECC81 Another popular twin triode. While there are many different types of preamp tubes, the most common type is the classic 12AX7. In most applications, but not all, RCA 12AX7 black plate are fantastic. Classifieds: FOR SALE - Another 26 Audio Vacuum Tube Lot ECC83 6SN7 6SL7 6CA4 5Y3 12AV7 asking for $225. The Tung-Sol EL84/6BQ5 is a popular EL84/6BQ5 tube for guitar amplifiers, such as those built by Gibson and Harmony. 1), and seems to cause bewilderment and inspiration in equal measure, among many valve enthusiasts. 6SL7-GT: Acrobat PDF 133K 12SL7-GT: Acrobat PDF 23K: National Valve Museum: 6SL7GT: html, html2: oldradio. Feedback received via email: “Hi Rachel, I received the 12AX7LS super tubes and their performance is super! Put the new tubes in and turn on, first 10 mins, comparing to Psvane 12AX7-TII…the new super tube has lower noise floor, sound is more dense and transparent, bass is deeper and better bass layering. If you are looking for a high mu tube and want to use something else as the 6SL7 tube or if you look for an Octal based alternative to a 12AX7, the 6SC7 might be the choice for you. Title: 12AX7 6AX7 Author: Sylvania Subject: JA-FP-2002-03-23 Created Date: 3/24/2002 12:54:30 AM. The 7K7 triode is identical to the 6AT6/6Q7/6SL7 triodes. Tube Depot carries a selection of 6SL7 Pre Amp Vacuum Tubes. Tavish Design's Vintage 6SL7 Phono Stage is a passively-equalized, two-gain-stage design using the 6SL7GT octal dual triode, a vacuum tube first introduced (by RCA) in 1941. 6SN7GTB TUNG-SOL. Â It was time to stop enjoying for a second and get into some serious listening with two other great tubes: the CBS-Hytron 5814 and Westinghouse 12au7 Carbon Plates. The 6DJ8 has to cathodes, two grids, two plates, one heater and one internal shield, for a total of eight elements. The SRPP is a most enigmatic circuit (fig. The 12AX7 is also used in many audio preamps and in guitar effects pedals. Well, seems 'WE replica' has been a theme for tube manufacturers from China. B: ECC83 or 12AX7 12AU7 12AT7 ECC81 ECC82 7025 CV4003 CV4004 5751 5814 6021. Flying Leads Plug&Play CV4033 - Premium 12AT7 ECC81 E81CC ECC801S 6201 6060 CV455 CV4024 type. Telefunken & others such as Raytheon 12ax7 black plate are not even close in performance compared to the RCA 12AX7 black plate. Some say they have all the best attributes of the 5691, with better richness and vocal clarity. The sound signature is on par with 5692 types. You also have know what the filament voltage is as well as the current. Today, a look at almost any guitar tube amp, be it Fender, Marshall, Vox, or any other, will prove the 12AX7 / ECC83 / 7025 tubes are here to stay. - tubes included : 3 6SN7, 1 6SL7, 1 12AX7, 1 6X5 - max. Good for phase inverters or reverb drivers. I've decided to relaunch my most popular seller with many upgrades while still keeping the price under $1K. We need a mention the fourth member of the Sovtek 12AX7 family. But this one is not an exact replica of Western Electric tube; instead it is a 'plus' version with slightly different structure - for example, getter for More Info ». Model shown : Low Gain Edition (2V Input Sensitivity) with full suit of Hashimoto (Sansui) Transformers, with max of 4. " As the signal passes through, preamp tubes influence the various EQ stages found in your amp, such as distortion, gain boost, tremolo and reverb. The 12AT7 is another very well known tube among guitar players. I actually read that review when it came out and have alway thought the SLP-94 a great preamp. Why We Don't Sell Certain Brands. Before you make the change, you might consider swapping a 5751 for the 12AX7 to see if you like the sound. 3 K ohm and find the RL is 123 K ohm by F 45, 120 K is practical. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. Mullard 12AX7 is an excellent all rounder, Mullard 12AX7 is one of the top choices for. For taming a bright system the RCA 6SL7 are recommended. The type 5691 Tube is a "premium" version of the type 6SL7. If you want to get an idea of the gain level of the 6SL7, try a 12AY7 or 12AT7 in there but again, I don't know if anything was done to your circuit to tame the 12AX7 (if anything) either way, it won't hurt the amp to try a lower gain, nine pin tube. Hand built 12AX7-based vacuum tube stereo preamplifier with tube power supply. GE used/tested 7025 $25. Can I solicit some opinions from anyone who has tried any octal preamp tubes? The 6SJ7 is a pentode preamp tube that was used in the first Fender Champ. The 6SL7 is an octal twin triode with amplification factor (mu) of about 70. The "premium" qualities of the 5692 include a long-life cathode rated at 10,000 hours along with extra support rods and mica spacers to eliminate microphonics. I've got a used chassis already drilled for octals, and that's what got me to look into them. How to use 6N1P and 6N2P Russian tube. ****OUT OF PRODUCTION***NLA****. It is a premium quality 12AU7 tube built to match the performance of the military/industrial original GE 6189 tube.