MOD® Reverb Tanks

Mod Reverb Tanks were carefully designed and researched to bring the warmth of a vintage sounding reverb to your amp.

What people are saying about MOD® Reverb Tanks:

"Longest decay rate of the three, very broad tone and is best suited for those who desire a long decay, ambient sounding reverb. Almost sounds like a large room. Lots of bottom end. Lots of hang time/dwell."

Questions and Answers
Click each question to see its answers. Looking for general answers about Mod Kits? See our frequently asked questions.
I have 60s era Thomas vox Solid State amplifiers that need new reverb tanks. Both input and output transducers on the original Gibbs tanks read a nominal DC resistance is approximately 170 ohms. Do you have a replacement?
Answers (1)
MichaelT
Staff Member
April 29th, 2019
DC resistance is unfortunately not much to go off since it can vary so much from the impedance. If you have model numbers I can look to see if there is any information on these amps and their reverbs.
Verified Answer
I have a broken reverb tank with code 9ab2a1b and a working reverb tank with code 4eb2c1b. The 9ab2a1b is the stock reverb tank from an Engl Classic Tube 50. Since the impedances are different - can I use the 4eb2c1b reverb tank instead or could this do any harm to the Engl amp?
Answers (1)
MichaelT
Staff Member
April 29th, 2019
It might not harm the amp but it will not work correctly.
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Hi, I need a replacement for a Accutronics 8CB3E1E from a Hughes & Kettner Statesman Quad EL84. There are any reverb tank compatible with that?
Answers (1)
MichaelT
Staff Member
May 2nd, 2019
We don't have anything compatible with that one. It's a pretty uncommon tank code. You might want to reach out to the manufacturer of the amp to see if they could supply one for one.
Verified Answer
Fender princeton '65 reverb reissue. the one that came with it is WAY too "springy" I want a more modern ambient one. help please
Answers (1)
MichaelT
Staff Member
May 6th, 2019
I think you might like the sound of Mod tanks given your description. Check out this video comparing 4AB3C1B reverb tanks from different manufacturers to get an idea of the tonal differences: https://youtu.be/c1IIiv89Qoc They're using the 4AB3C1B which is the stock tank in a Princeton Reverb like an Accutronics in your amp. I think you might also be interested in the 3 spring version which is a 9AB3C1B. This video compares the three spring with the two spring: https://youtu.be/Wg8hBVHEAqo
Verified Answer
What would a replacement Reverb tank for a Peavey Studiopro 40?
Answers (1)
MichaelT
Staff Member
May 13th, 2019
There isn't a lot of info on this amp available. It might be worth contacting the manufacturer. I know Peavey used the 8EB2C1B a lot but that is only a guess and a confirmed answer from them would be preferable.
Verified Answer
Howdy, I need a reverb tank for a Marshall Valvestate AVT50 Combo.
Answers (1)
MichaelT
Staff Member
May 20th, 2019
A search online shows the 8DB2C1D as a compatible tank for that amp. I would still recommend checking the old tank for any markings to be sure since a schematic is not readily available to confirm this.
Verified Answer
I have a 1982 Legend Model A 30 amp with the black cloth and Eminence Legend G12-30 speaker. It is not a series II, it is the original design. The reverb tank is missing. What would be the replacement tank? Pretty sure it would be a type 4, but no idea on the impedances.
Answers (1)
MichaelT
Staff Member
May 24th, 2019
The schematic found online lists an input impedance of 1475 and an output impedance of 2250 so the FB tanks will be the compatible ones. It also looks like the input needs to be insulated and the output is grounded. The 8FB3C1B looks like it should be compatible as long as the schematic is accurate. If it has room for a longer tank the 4FB3D1B might work but the output jack might need to be modified to be grounded on this tank. This would require jumpering two solder pads on the output jack inside of the tank.
Verified Answer
Reverb kit for Marshall dsl15c
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No answers yet!

vox ac15 newer amp what tank?
Answers (1)
MichaelT
Staff Member
May 28th, 2019
The AC15C1 uses an 8EB2C1B.
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Tank replacement for the early 80s Ampeg v7?
Answers (1)
MichaelT
Staff Member
June 5th, 2019
There is not much out there on this one, not even a proper schematic. Are there any marking on the original tank?
Verified Answer
Replacement Reverb tank for a 50 watts tude Epiphone head.
Answers (0)

No answers yet!

Hi, I have a Fender era Sunn T50C combo. What would be the proper reverb tank replacement? Thank you.
Answers (1)
MichaelT
Staff Member
June 20th, 2019
The schematic lists the 4AB3C1B as the tank used in the T50C.
Verified Answer
I'm looking for an alternative or clone for the accutronics 9AB21B.
Answers (1)
MichaelT
Staff Member
June 26th, 2019
Is there a letter after the 2 on your code ie 9AB2_1B?
Verified Answer
Hi I have a small combo Crate GX-20M/R, the reverb tank it's not labeled normally, it just says "79-301-01" n one sticker, and "8" on a separate sticker. It has 2 exposed 9" springs, and ather than float on support springs, it is glued to the amphead's frame with a foamlike glue. I was guessing a 1AB2B1B or a 1BB2D1B (along those lines) seems plausible, but i am completely out of my element here and sadly i don't have the proper tools or expertise to measure the correct impedance, would kindly appreciate any guidance!
Answers (2)
MichaelT
Staff Member
July 1st, 2019
There isn't much to go off on this one. I would guess that it is not going to be an AB type since these are more common to transformer driven circuits. BB, DB, EB, or FB would be more likely. Solid state circuits often use a higher impedance input. Looking at a schematic on the GX amps, the input probably needs to be insulated and the output sleeve is likely grounded.
Verified Answer
Anonymous
July 1st, 2019
Thanks MichaelT, I'll carry on with my research if i get it working i'll come back and update. Have fun during the holidays.
Could you please recommend a replacement tank for the vintage Selmer treble n bass sv reverb 50, its a short 2 spring reverb tank but one transducer has broken off.
Answers (1)
MichaelT
Staff Member
July 12th, 2019
I don't have any way to verify this but there is a guy on Youtube with one of these. He put a full sized 9AB3C1B in his but mentioned the original was a short tank. The short version of this would be the 8AB3C1B.
Verified Answer
Need rich lush upgrade tank for solid state fender Princeton 112 What do u think? Thx
Answers (1)
MichaelT
Staff Member
July 17th, 2019
The service manual says the stock tank is an 8EB2C1B. I always recommend double checking these against the one in your amp in case there have been any changes. The 8EB2C1B is a short 3-spring medium-decay tank. For the same specs but with a long decay you could use the 8EB3C1B. I'm not sure if there is room in that amp for a full sized tank but if there is, the 4EB3C1B would be a good choice. This is a 16.75" 2-spring long-decay tank that can work in place of the 8EB2C1B. Be sure to check the dimensions inside your amp though!
Verified Answer
Hi can I hook This up to a Fender blues break your head there’s no special plug-in for reverb I just have a line out input jack or a line out and a Import check loan out for speaker
Answers (1)
MichaelT
Staff Member
July 22nd, 2019
Reverb tanks need specific circuitry to function in an amplifier. Without modding the amp or using external equipment, a reverb tank will not function with that amp.
Verified Answer
Hello I have a LAB series L11. The tank is too corroded to read any numbers on it. Would you happen to know the model I need? Thanks.
Answers (1)
MichaelT
Staff Member
July 24th, 2019
There is a schematic online that lists the following models: L5 Model 308A, L7 Model 309A, L9 Model 312A, and the L11 Model 313A. You might want to check yours against this schematic to make sure it is the same L11. This schematic lists the tank's input impedance as 8 ohms and the output as 2250 ohms. The 4AB3C1B might be a compatible tank. We have no way to verify it but if you have a Fender amp or a friend with one, many of them use the 4AB3C1B so you might be able to test it out.
Verified Answer
Hello there, i have a Mesa/Boogie Satellite 60 with no reverb. Can i mod it with your tank? If so how? Thank you
Answers (1)
MichaelT
Staff Member
August 12th, 2019
Unless the amp already has the drive and recovery circuits needed, a spring reverb tank is not compatible without heavy modifications.
Verified Answer
I'm looking for the proper reverb tank for an ASI Quantum QTube 70 - there are cables to connect one, but the actual tank is missing on my unit. Any recommendations? Thanks!
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No answers yet!

Do you have a reverb unit for a Ampeg G12 Gemini 1 amp? I was told an accutronics 4FB2D1B would work. Thank you Bob Ackerman Cascio Interstate Music.
Answers (1)
MichaelT
Staff Member
August 29th, 2019
The 4FB2D1B is compatible with the Type C tanks that were commonly used in the tube driven Ampeg reverb circuits. The version we carry has the long decay and is the 4FB3D1B.
Verified Answer
What reverb tank is made for a Fender Super Sonic 60 manufactured in 2009?
Answers (1)
MichaelT
Staff Member
September 9th, 2019
The schematic from 2009 for the Supersonic 60 shows a 4AB3C1B tank.
Verified Answer
hi there, i have a peavey classic 30.what reverb unit would be a good replacement for it that sounds great? thanks so much,brian
Answers (1)
MichaelT
Staff Member
September 11th, 2019
The stock tank is a 4EB2C1B. If you would like a compatible tank with a longer decay time, the 4EB3C1B would work. The 9EB2C1B is the three spring version of the stock tank. We also have the three spring version with the long decay time which is the 9EB3C1B. Check out the videos linked below for some sound comparisons of the variations listed here. Decay length comparison: https://www.youtube.com/watch?v=ZNHZEQRDOOI 2 vs 3 spring: https://www.youtube.com/watch?v=Wg8hBVHEAqo
Verified Answer
Hi, I'm looking for a 9AB3C1C tank but haven't found one. Do you have any recommendations?
Answers (1)
MichaelT
Staff Member
September 16th, 2019
A 9AB3C1B will likely work in its place but I would suggest testing before fully installing to be sure.
Verified Answer
Hello, I just purchased your MOD 8EB2C1B reverb tank. I always have my amp on the floor, tilted back 30 degrees, so the speaker is pointing up. Should I mount the reverb tank at -30 degrees (relative to the amp) so the tank is parallel with the floor when the amp is tilted? Thanks!!
Answers (1)
MichaelT
Staff Member
September 23rd, 2019
You should be good to install it flush to the bottom of the cabinet. There shouldn't be any noticeable difference in the sound or functionality with it tilted back.
Verified Answer
I need a reverb tank for a 1982 Fender Princeton Reverb II. The original tank was an Accutronics 8AB2C1B. Do you have one that can be used as a replacement?
Answers (1)
MichaelT
Staff Member
October 10th, 2019
We don't have a tank that is compatible without potential modifications to the grounding scheme. You might have better luck finding an 8AB3C1B. That tank only differs in that the decay length and won't require any modifications for use.
Verified Answer
Hello, I need a replacement tank for a fender frontman 15r. 1bb2e4a. I can't find one that matches, any help
Answers (1)
MichaelT
Staff Member
October 16th, 2019
That one does not have the outside chassis like most tanks so I'm not sure if anyone will be selling them as a retail product. You might be able to use a tank with similar impedances to replace it. Some people modify that amp for RCA jacks to use common tanks. Another way would be to modify the tank by removing it from the chassis and rewiring it so it can mount internally.
Verified Answer
What reverb tank is compatible with Fender "Twin Amp" Black knob '94.
Answers (1)
MichaelT
Staff Member
October 21st, 2019
The schematic for that amp shows part number 064063 which is the 4AB3C1B.
Verified Answer
Which MOD tank replaces the Fender Twin Reverb Reissue tank; It must have 3 spring with medium decay....Thanks. Kevin
Answers (1)
MichaelT
Staff Member
October 22nd, 2019
The stock tank in a Twin Reverb is the 4AB3C1B. A three spring version of that tank with a medium decay would be a 9AB2C1B.
Verified Answer
What’s the nearest replacement tank for a Marshall 3210 ? (Lead 100 Mosfet head, tank is mounted under the top surface inside the head)
Answers (1)
MichaelT
Staff Member
October 23rd, 2019
It's not listed in the schematic so I don't have any way to confirm this but a few posts online point to the 4DB3C1D.
Verified Answer
I need to find a replacement reverb tank for a 1971 Univox U1011 tube amp head. The original was probably mounted in the Univox speaker cab which I didn't get. A older Univox amp head uses a #4FB3A1B. Could you help me out?
Answers (1)
MichaelT
Staff Member
October 23rd, 2019
The schematic for that amp does not list any impedances or tank code. If you can locate a schematic for the older unit that you know the tank code for, you could compare the circuits. Amp manufacturers often use the same reverb circuits in different amps.
Verified Answer
I have a broken reverb tank with code 9ab2a1b and a working reverb tank with code 4eb2c1b. The 9ab2a1b is the stock reverb tank from an Engl Classic Tube 50. Since the impedances are different - can I use the 4eb2c1b reverb tank instead or could this do any harm to the Engl amp?
Answers (1)
MichaelT
Staff Member
October 31st, 2019
It probably won't harm the amp but it is very unlikely to produce any usable effect. We would recommend using a tank with the correct impedances.
Verified Answer
Hi! do you have a replacement for a fender blues jr's reverb tank? thank you!
Answers (1)
MichaelT
Staff Member
November 7th, 2019
The 8EB2C1B is the tank used in the Blues Junior.
Verified Answer
What is the tank for a Traynor YGL-3 around 1973 and a Traynor YSR-1 around 1971? Are they the same type? Thanks
Answers (1)
MichaelT
Staff Member
November 19th, 2019
The YGL-3 mkIII service manual lists a 4FB2B1C. The YSR-1 schematic lists a Gibbs type C which is equivalent to a 4FB2A1C. We're unsure of any reverb changes that might have occurred in the manufacturing of these two amplifiers so please double check your amps against schematics to confirm compatibility.
Verified Answer
I’ve got a Matchless Chieftain and a Matchless Avenger 30. My Chieftain has a MOD 4ab3c1b. Does the Matchless Avenger use the same reverb tank?
Answers (1)
MichaelT
Staff Member
November 22nd, 2019
We're not sure of which tank is used in the Avenger 30. It be be worth asking the manufacturer to see if they could help you out.
Verified Answer
Do you have the a model to replace the accutronics unit in the trademark 10 by tech 21?
Answers (1)
MichaelT
Staff Member
November 26th, 2019
There isn't much info out on which tank in used in that amp. Are there any marking on the original tank? Thanks!
Verified Answer
I have a deluxe Reverb 2 Rivera
Answers (1)
MichaelT
Staff Member
December 4th, 2019
The Deluxe Reverb II uses a 4AB3C1B.
Verified Answer
Should I remove the grey sponge that came with my MOD reverb tank?
Answers (1)
MichaelT
Staff Member
December 2nd, 2019
Yes. That is used to keep the springs in place when shipping but needs to be removed before installing the reverb tank.
Verified Answer
Hello, what tank is compatible with the fender 63 reissue reverb unit? Thanks.
Answers (1)
MichaelT
Staff Member
December 2nd, 2019
The 4AB3C1C is the stock tank for that unit.
Verified Answer
What reverb tank would work well in a VOX AC30C2?
Answers (1)
MichaelT
Staff Member
December 5th, 2019
The 9EB3C1B works with the AC30C2.
Verified Answer
Hello, what tank is compatible with the MusicMan RP112 reverb unit? Thanks. This amp is a 6CA7 tubes of 1979. Thank for your answers
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No answers yet!

Have a missing reverb tank in Fender Champ 30 any ideas please
Answers (1)
MichaelT
Staff Member
December 10th, 2019
The Champion 30 uses a small internal reverb unit and would require modifications to the amp or the tank to work with a MOD tank. We can't find any specs listed on the tank but if you could provide more information we might be able to make some suggestions.
Verified Answer
Hi what do you have for a replacement reverb in a Deluxe Reverb Reissue? thanks
Answers (1)
MichaelT
Staff Member
December 17th, 2019
The Deluxe Reverb uses a 4AB3C1B.
Verified Answer
Hi, i have a 1974 univox U-65Rn model with a Hammond short tank reverb. when i dial the knob with or w/o instrument plug in, there a louder and louder buzz coming out. the reverb works but very crappy sound. i would like to replace it , any replacement with longer decay? the amp is 16'' wide. thanks. Michel
Answers (1)
MichaelT
Staff Member
December 17th, 2019
Hey Michel. Are there any markings on the tank? Matching the impedance is important when replacing reverb tanks.
Verified Answer
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Hello, I need a replacement reverb tank for a Fender Hot Rod Deville sn B-254600. I spoke to a rep at fender and he recommended a tank with 600 on input and 2250 output. Can you please recommend MOD a replacement part number?
Answers (0)

No answers yet!

I need a good quality tank for a Peavey Classic 50 2x12 (2005). Impedances on the existing tank are 55 ohms and 205 ohms. What model would be a good match?
Answers (1)
MichaelT
Staff Member
December 30th, 2019
We don't have a way to verify this but the 8EB2C1B is mentioned online as the stock tank by users of this amp.
Verified Answer
Hi! I need a replacement reverb tank for my Farfisa F/AR unit. Its' a type 4 Hammond-style with a transportation lock. There is no information written on it. The input plastic bobbin are brown and the output plastic bobbin are red. But I don't know how reliable those color codes are. Do you got any idea?
Answers (1)
MichaelT
Staff Member
January 3rd, 2020
We couldn't find too much on it either. Most transistor driven circuits use a higher input impedance such as the E types or F types but there are exceptions.
Verified Answer
I need a replacement reverb tank for a fender Deville hot rod. This is my third request for information via your contact us section of the website and I have yet to get a reply. Please contact me ASAP at 818-497-3624 or dcorrao@iCloud.com thanks
Answers (1)
MichaelT
Staff Member
January 2nd, 2020
The Hot Rod Deville uses a 4EB3C1B.
Verified Answer
whats the impedance and dc resistance of the input coil on a model P_Rmod-9AB2A1B TANK ?
Answers (1)
MichaelT
Staff Member
January 7th, 2020
The input impedance is 10 ohms on the 9AB2A1B. The DC resistance measures roughly 1 ohm but keep in mind that this will not be consistent across different brands of tanks.
Verified Answer
I need a replacement transducer magnet for a Peavey backstage chorus solid-state amplifier do you carry them?
Answers (1)
MichaelT
Staff Member
January 14th, 2020
We only have complete tanks.
Verified Answer
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