MOD® Reverb Tanks

The MOD® Reverb Tanks are high quality upgrade units. One of the major differences between the MOD®s and other reverb tanks is that the Transducers are wired directly to their respective RCA jacks as opposed to other current-production tanks where Transducers are connected by a detachable plug to their respective RCA jacks. This makes the tanks less receptive to any outside interference. The original Hammond Accutronics tanks from the 1960s were also wired directly to their respective RCA jacks. In addition, very close attention has been paid to the spacing and size of the lamination of the Transducers resulting in a more vintage like tone.

Questions and Answers
Click each question to see its answers. Looking for general answers about Mod Kits? See our frequently asked questions.
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
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.
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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.
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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
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.
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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.
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.
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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
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?
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
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.
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What reverb tank would work well in a VOX AC30C2?
Answers (1)
MichaelT
Staff Member
December 5th, 2019
The 9EB3C1B works with the AC30C2.
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what do you have for a replacement reverb in a Deluxe Reverb Reissue?
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
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No answers yet!

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?
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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
My Vox AC15-C1 has been upgraded with a Celestion Alnico Blue speaker and Mullard tubes. It currently uses a Ruby Tubes RRVS3EB1C1BX reverb tank. What are my options for a MOD tank? Thank you!!
Answers (1)
MichaelT
Staff Member
January 24th, 2020
The 9EB2C1B is compatible and offers the medium decay length for that tank whereas your stock tank has a short decay length. The 9EB3C1B is also compatible but has the long decay length.
Verified Answer
Will the 9ab3c1b fit a Fender Hot Rod Deluxe?
Answers (1)
MichaelT
Staff Member
January 27th, 2020
That tank does not have the correct impedances for a Hot Rod Deluxe. A three spring tank with the correct impedances would be the 9EB3C1B.
Looking for a stock reverb unit for the Crate Acoustic 60. The number on the tank is 79-201-02. I mean close to stock. The customer is not fussy. It's a short style tank.
Answers (1)
MichaelT
Staff Member
January 28th, 2020
The 79-201-02 tanks can be replaced with 8BB2C1B.
Hi, Thank's for your work! I'm looking for a 1.8s decay 3 spring tank. How can i know the initial delay of each springs? The one i'm looking for is 33, 37 and 41 ms of initial delay.
Answers (1)
MichaelT
Staff Member
February 19th, 2020
You would want a short or medium decay length for ~1.8s decay. This would be tanks with 1 or 2 as the fourth digit. The delay time is tied to the decay length. short and medium tanks will be in the range of ~33-37ms.
I need a replacement for a 90s fender blues DeVille 410 which unit is it?
Answers (1)
MichaelT
Staff Member
February 27th, 2020
The original 90s Blues Deville uses a 4BB3C1B.
What is a replacement tank for an 8ab2c1b tank ?
Answers (1)
MichaelT
Staff Member
March 9th, 2020
The 8AB3C1B is a more common tank that is compatible. It has a long decay length rather than the 8AB2C1B's medium decay length.
I have a marshall valvestate vs102r the reverb tank is 8db2c1d do you have a tank for this amp
Answers (1)
MichaelT
Staff Member
March 16th, 2020
Yes. If you search 8DB2C1D on https://www.amplifiedparts.com/ you will find this tank.
What is the nominal output level difference between a reverb tank with 2.575 K Ω output impedance versus one with a 600 Ω output impedance?
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No answers yet!

Will the MOD 4AB3C1C work in a 90s Fender Reissue Reverb unit? Or is there another MOD tank you'd recommend?
Answers (1)
MichaelT
Staff Member
March 23rd, 2020
The 4AB3C1C is the stock tank for the 90s reissue version of the '63 Fender Reverb.
1976 Peavey Festival Head - 220 Series (4 Ohm) I bough it with the reverb tank missing - Looking for something that would match nicely. Currently has 2x 12" 16 Ohm speakers but will probably replace with 2 x12" 8 Ohm speakers - if that makes a difference. thank you
Answers (3)
MichaelT
Staff Member
April 3rd, 2020
Do you know the stock reverb tank code? We can't find much info on this model.
Verified Answer
Anonymous
April 6th, 2020
I just took it apart looking for any markings. It's actually a 1975 head - same numbers as a Peavey Deuce II. https://www.manualslib.com/manual/121206/Peavey-Deuce-Ii-Festival.html#manual I don't know the stock reverb tank code... I installed a 9FB2A1C a few years ago but was never too happy with the results... thought maybe I installed the wrong type. Was thinking of going with w/ 2 spring but wanted to check here first. Thanks
MichaelT
Staff Member
April 6th, 2020
Peavey oftens uses 4EB type reverb tanks in their amps. It's still a shot in the dark but if you have a chance to try different tanks at any point, a 4EB tank might be worth checking out.
Verified Answer
I'd like to build a stand alone tank for a 1952 Fender Deluxe. Which reverb unit would go well?
Answers (1)
MichaelT
Staff Member
April 3rd, 2020
It needs the full Stand Alone Reverb to pair with it but the 4AB3C1B is the classic tank used in Fender amps.
Verified Answer
What is replacement for 4bb2c1d
Answers (1)
MichaelT
Staff Member
April 6th, 2020
We carry a 4BB3C1D that will work in its place. The only difference is that the 4BB3C1D has a long decay length whereas the 4BB2C1D has a medium decay length.
Verified Answer
Hi, Do you have a 8ab2c1b tank? If yes Where I can find it? Thx!
Answers (1)
MichaelT
Staff Member
April 17th, 2020
We don't have an exact match for that. The closest we have is the 8AB2A1B.
Verified Answer
Pour Tête Ampli MANHATTAN 6024 REVERB , quelle unité de reverb. aucune idée sur les impédances I/O
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No answers yet!

I have a old multivox premier 90 reverb unit. Which tank is a replacement? Thanks
Answers (1)
MichaelT
Staff Member
April 23rd, 2020
We can't locate much info on that one. It looks like the schematic shows a transformer used in the driver. If you have access to an impedance meter, you might be able to determine the tank's input impedance by measuring the secondary of the transformer. This would need to be a impedance measurement rather than a standard resistance measurement found on most multimeters.
Verified Answer
Hello, i find the reverb on my blues deluxe reissue a bit underwhelming, no body, only shrill upper registers and hardly any volume and decay when i turn it full on. Is there a way of improving this with another reverb tank, without modding the amp? Can you recommend me a reverb tank?
Answers (1)
MichaelT
Staff Member
May 12th, 2020
Our tanks do have a bit more volume and noticeable decay than the stock Accutronics tanks. There is a comparison here that might help determine if our tanks are what you're looking for. https://www.youtube.com/watch?v=c1IIiv89Qoc
Verified Answer
Hi, I am looking to replace my reverb tank on a Traynor Reverb Mate 40. It is written SH-250 In 490 - 490 OUT
Answers (1)
MichaelT
Staff Member
May 12th, 2020
Are the any other letters/numbers on the tank? 490 - 490 doesn't match any typical tank impedances.
Verified Answer
HI I'm looking for a short long decay tank to work with a fender blackface reverb circuit. I build my own amps and the little cabinet I made won't accommodate a long tank, though I like the sound. Do you folks have a 9.5" long decay tank taht would work with the classic fender blackface reverb circuit? Thanks
Answers (1)
MichaelT
Staff Member
May 18th, 2020
We don't carry one but the tank you're looking for is an 8AB3C1B.
Verified Answer
HI, I need to replace a Fender Sidekick Reverb 25, it has a 2 spring Hokusei 15 tank reverb, wich model it is compatible? Thanks Alex
Answers (1)
MichaelT
Staff Member
May 26th, 2020
Do you know the impedances on the stock tank?
Verified Answer
Hi. I have a Peavey Classic 30. What reverb tank would work best for classic reggae type reverb?
Answers (1)
MichaelT
Staff Member
May 29th, 2020
The 4EB3C1B is a long decay version of the tank used in that amp that could work well in this context.
Verified Answer
Hi, what model should I use to upgrade the reverb in a stage right ( monoprice) 40 watt solid state model 611800
Answers (1)
MichaelT
Staff Member
June 2nd, 2020
Do you know the impedances of the stock tank?
Verified Answer
Hi, do you have a spring Reverb unit with a short decay that would work with my Tweed Blues Junior that was made in June of 2018?
Answers (1)
MichaelT
Staff Member
June 2nd, 2020
The 8EB1C1B is the short decay version of the tank used in the Blues Jr. You can pruchase it here: https://www.amplifiedparts.com/products/reverb-tank-mod-8eb1c1b-short-decay-3-spring
Verified Answer
HI - I need a replacement reverb tank for a Carr Viceroy amp. Which MOD model would be the best fit for this amp? Thank you!
Answers (1)
MichaelT
Staff Member
June 29th, 2020
Do you have the tank code for the stock tank?
Verified Answer
I. Have a fisher to 200 amp with a space expander jack stereo can I use your reverb kit to replace my unavailable space expander 100
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No answers yet!

Can I replace a fisher space expander 100 with it
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i’m having a BF deluxe reverb clone built, and i want the absolute maximum reverb i can get. i’m guessing that’s a long decay 3 spring?
Answers (1)
MichaelT
Staff Member
June 19th, 2020
You can't go wrong with a two spring or three spring long decay in that amp. Check out this video for a comparison of two spring versus three spring. https://www.youtube.com/watch?v=Wg8hBVHEAqo
Verified Answer
Hi, I am looking for a better reverb tank than my 73 Peavey Vintage 2x12 has. It is ok bit needs more reverb and decay. I am guessing it could use a 3 spring with a long decay but I don't really know. I am looking for a surf type sound. Thank you!
Answers (1)
MichaelT
Staff Member
June 29th, 2020
Do you have the tank code for the stock tank?
Verified Answer
I have a broken Accutronics 4fb3a1b which has a long decay, I would like to replace it with a medium decay unit. It seems that the original has 1475 and 2250 impedances, do you know of a suitable replacement? I would like to keep the original 16" size, Thank you.
Answers (1)
MichaelT
Staff Member
June 29th, 2020
We don't carry one but the tank you are looking for is a 4FB2A1B.
Verified Answer
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