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.
fender supersonic 60 1x12 combo reverb tank replacement. thank you!!
Answers (1)
MichaelT
Staff Member
October 15th, 2018
According to the schematic, that amp uses a 4AB3C1B.
Verified Answer
Hi! I'm looking for a Mod tank, wich would be the closest as the tank of gibbs/hammond A846-109A or accutronics 4FB2B2C . I want to make a clone of FISHER K10 SPACEXPANDER, but I want to find a Mod Tank wich would have a very similar sound.. Thank You!
Answers (1)
MichaelT
Staff Member
October 16th, 2018
The closest we might have is the 4FB3D1B or the three spring 9FB2A1C. None of the tanks we sell have the locking mechanism which is digit 6 of the code. The 5th digit on these tanks is also different meaning that the input and output have a different grounded/insulated setup. This is easily modified by jumping or desoldering two solder pads. The 2 spring tank has a different mounting plane designated by digit 8 of the code.
Verified Answer
I'm fixing a Carvin Vintage 16 and the reverb tank is dead. Do you know what kind of tank it takes. The tank in there is an Accutronics unit labeled 8GB3C1B. I've never heard of that tank. The other code on the unit is 13 266 02. Thanks.
Answers (1)
MichaelT
Staff Member
October 16th, 2018
I believe the G is a very high input impedance. The highest input impedance we have is the F. The 8FB3C1B is the closest we have to that tank.
Verified Answer
Im looking to replace the accutronics reverb tank in my Mesa Boogie DC-5 and was wondering what would be the best MOD tank for it and also does the tank come with wires or does that need to be purchased separately ? Thanks
Answers (1)
MichaelT
Staff Member
November 8th, 2018
We have a 9AB2A1B that is compatible with that amp. The tanks do not comes with RCA wires.
Verified Answer
I have a Carvin Vintage 16 that needs a new tank. The old tank is labelled 8GB3C1B. Is there such a tank? I can't find one with that input impedance.
Answers (1)
MichaelT
Staff Member
November 8th, 2018
We don't have any G type tanks which have an 8,333 ohm input impedance. The closest model we have is the 8FB3C1B which has an input impedance of 1,925 ohms.
Verified Answer
I have a 1989 Boogie Mark III head with a custom cabinet the only has room for a 9 1/4" tank. Which should I use?
Answers (2)
MichaelT
Staff Member
November 9th, 2018
We have the 8AB2A1B which should be compatible with that amp according to the schematic.
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MichaelT
Staff Member
November 9th, 2018
We have the 8AB2A1B which should be compatible with that amp according to the schematic.
Verified Answer
I have an Ampeq Gemini 1 what would be the replacement reverb? Thank you Bruce
Answers (1)
MichaelT
Staff Member
November 14th, 2018
Hey Bruce. I believe that amp originally had a Gibbs type C reverb tank. The 4FB3A1B is compatible with the type C tanks.
Verified Answer
I'm looking for a replacement reverb tank for a 1969 Guild Thunderstar. The current tank has two sets of numbers printed on it (28A0001) and (6445). The tank measures 17"x3 ¼". Thank you!
Answers (1)
MichaelT
Staff Member
November 19th, 2018
I'm not sure if it's an exact match but people report that the 4AB3C1B works and sound good in that amp.
Verified Answer
reverb tank for gibson ga 15-rvt ? its the model with reverb transformer thanks
Answers (1)
MichaelT
Staff Member
November 27th, 2018
This one is difficult to find any information on. Gibson used a reverb transformer that typically drives an xFBxxxx type tank but I'm not sure if that is the transformer in this model. The input impedance is the F which is 1,475 Ohms. The output impedance is the B which is 2,250 Ohms.
Verified Answer
Suggested reverb tank for a Dean Markley K-50, I saw someone used a MOD®, 8EB2C1A but struggling to find one in the U.K. is there any alternatives that could be used?
Answers (1)
MichaelT
Staff Member
November 26th, 2018
The 8EB2C1B has the same specs as the 8EB2C1A but the open side is oriented downward. The 4th digit can be changed and still work as well. 1 is short decay, 2 is medium decay, and 3 is long decay.
Verified Answer
Can I replace a 8AB2A1B tank with a 4AB3C1B tank? If not, is it possible to order a 4AB3A1B tank from you guys?
Answers (1)
MichaelT
Staff Member
November 30th, 2018
These have two different grounding schemes. The 8AB2A1B has Input Grounded/Output Grounded and the 4AB3C1B has Input Insulated/Output Grounded. The input of the 4AB3C1B can easily be grounded by bridging the two solder pads next to the jack on the inside of the tank. Email us at info@modkitsdiy.com if you have any questions.
Verified Answer
Hi I have a p-mod-4ab3c1b tank that has to much tail to the reverb and not a lot of depth was wondering what you would recommend for a shorter tail and less jangle? thanks
Answers (1)
MichaelT
Staff Member
December 10th, 2018
Here's a video comparing the short, medium, and long decay tanks https://www.youtube.com/watch?v=ZNHZEQRDOOI
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Hello I just picked up a vintage crate cr212. I want long deep reverb. My tank looks small has rca inputs. What do I use? I'm moving the tank from chasis to the bottom of the 2x12 cab.
Answers (1)
MichaelT
Staff Member
December 13th, 2018
Does the current tank in your amp have a code on it?
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Hey, Which tank for 1968 Pro Reverb? Thanks. c
Answers (1)
MichaelT
Staff Member
December 17th, 2018
That amp uses the 4AB3C1B.
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Horizontal or vertical installation?
Answers (1)
MichaelT
Staff Member
December 17th, 2018
We have both. Was there a specific tank you were looking for?
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I have just purchased one of your 4FB3A1B tanks as I was informed (not by you) that it was the replacement for a tank fitted to a Selmer Thunderbird twin 50 mk11 circa 1965( I do not have the original tank for comparisons) it there any mod. I need to make to the amp to make it completely compatable?
Answers (1)
MichaelT
Staff Member
January 2nd, 2019
From what I'm seeing online it looks like that tank has the correct input and output impedances but the connectors are configured incorrectly. From what I'm seeing, the connectors both need to be insulated and that tank has both grounded. This is easy to modify but double check that it's necessary before changing anything. There are solder pads on the boards where the RCA connectors mount. On your tank there should be a solder bridge connecting two of the pads on each connector. To insulate these connectors you need to remove than solder. The easiest way is to use solder braid or a solder sucker.
Verified Answer
I have a Gretsch/Valco 6165 amp built around 1965-66 with a Gibbs F 6452 tank in it. It has "4" springs, ie. 1 pair of 2 springs connected together, in a 9" box, horizontally mounted on the floor of the amp. I'm no longer getting much range/variation in the Intensity setting. It stays pretty much the same regardless of how high or low I turn it . I measured the DC Ohms on the tank and the Input is reading 2 ohms, and the output reads 267 ohms. Any thoughts on what the problem is and a solution? Thanks. Stephen
Answers (1)
MichaelT
Staff Member
January 3rd, 2019
Hey Stephen. It might be worth getting the amp inspected to see if maybe part of the reverb circuitry besides the tank is causing issues. The Gibbs F tanks are the xFBxxxx tanks so a 9.25" one would be 8FBxxxx.
Verified Answer
Hi, what tank would be used for a Kustom 72 coupe amplifier? tHANKS
Answers (1)
MichaelT
Staff Member
January 22nd, 2019
I haven't been able to find any info on that amp's reverb. Does the tank have any markings on it?
Verified Answer
I think I need a reverb tank for my Tech21 Trademark 60. I'm not sure what the ohms should be for the input and output. Mine is open on the input. And the output is only 60ohms. I bought the Amp used and I'm sure it was messed with. If you have the info on which one I need I'll order it as soon as you let me know which model. Thanks.
Answers (1)
MichaelT
Staff Member
January 29th, 2019
We haven't been able to locate any information on the tank used in that model. You may want to reach out to the manufacturer if there is not a code printed on the tank.
Verified Answer
Can I use a 4AB3C1B in a Vox AC30CC2?
Answers (1)
MichaelT
Staff Member
January 31st, 2019
It won't work correctly. The 4EB3C1B has the same number of spring and same decay length as that tank but with the correct impedances for the Vox. The 4AB3C1B will work in many Fender amps though.
Verified Answer
Which tanks will fit my Mesa Boogie Fillmore 50?
Answers (1)
MichaelT
Staff Member
February 11th, 2019
There isn't any information on that one yet. Many Mesa amps with a long tank use the 9AB2A1B. I would recommend checking your tank to see if there are any stickers/stamps with a model number.
Verified Answer
I have a 95 fender blues deville. Which tank should I replace with to get the biggest reverb sound possible.
Answers (1)
MichaelT
Staff Member
February 12th, 2019
The original non-reissue Blues Deville uses a 4BB3C1B.
Verified Answer
Can you change an amp with digital reverb like the blackstar ht club 40? Or Add to an amp that doesn’t have reverb?
Answers (2)
MichaelT
Staff Member
February 19th, 2019
It's possible but requires a good amount of circuitry and possibly an addition power supply. Stand alone spring reverbs are an easier solution and can be put in the fx loop for a similar signal path.
Verified Answer
MichaelT
Staff Member
February 19th, 2019
It's possible but requires a good amount of circuitry and possibly an addition power supply. Stand alone spring reverbs are an easier solution and can be put in the fx loop for a similar signal path.
Verified Answer
I need a Reverb Tank for my 1985 Peavey Special 130 Amp. Do you have one for it? I bought the amp today and the reverb tank was missing. So, I need a new one.
Answers (0)

No answers yet!

Hi, Which MOD tank comes in the Carr Rambler & I love it...? How do I pick one out for my Mesa Boogie DC3 combo? Is the tank in the Rambler considered medium or long? Thanks, Kenny
Answers (1)
MichaelT
Staff Member
February 25th, 2019
Hey Kenny. You might want to double check with Carr but I think they use a 4AB3C1B in that amp. A 4AB3A1B should work in the Mesa and be closer to that Carr tank. Keep in mind that the circuits around the tanks might have a different sound too.
Verified Answer
Hello there I have a Mesa Blue Angel amp with a broken tank it's a 3 spring model With 9AB2A1B serial no and Sounds enhancements Inc on it. Would you have a tank for me ?
Answers (1)
MichaelT
Staff Member
March 4th, 2019
We have a 9AB2A1B that can be purchased here: https://www.amplifiedparts.com/products/reverb-tank-mod-9ab2a1b
Verified Answer
I have a Vox Pathfinder 15R combo, I would like to replace the spring reverb unit inside. What options would you suggest for me?
Answers (1)
MichaelT
Staff Member
March 11th, 2019
We don't have one that will fit inside as a replacement but have seen people modify their amps to connect to an 8EB2C1B.
Verified Answer
hello I have an Ampeg SuperJet 12R (Blue Diamond ) it needs a new tank , the original one is a Belton BS2BB2C1A, any idea of what would be the mod tank for it , I woud like to order, thanks
Answers (1)
MichaelT
Staff Member
March 11th, 2019
We don't have an exact equivalent to that tank which would be a 4BB2C1A. One we have that will work is the 4BB3C1B. There are two differences in this tank. The first is that it has a long reverb decay whereas your original tank has a medium. The other is that this tank is meant to be mounted with the open side facing down whereas your original tank is meant to be mounted with the open side facing up. Send us an email at info@modkitsdiy.com if you have any questions!
Verified Answer
Can a reverb tank from a Fender Frontman 25R be installed on a Champion 30 that has no reverb at all? I don't want to go digital. Can anyone help? Thanks. Any good drummer jokes?
Answers (1)
MichaelT
Staff Member
March 18th, 2019
A spring tank needs additional circuitry to function in an amplifier. You might want to look into stand alone spring reverb unit or pedal.
Verified Answer
Hi, I would like to replace the missing Reverb Tank in a Carvin x100b series 3 head. Since the original one was missing when I bought it, I have no clue as to which MOD tank will work. Thanks!
Answers (1)
MichaelT
Staff Member
March 18th, 2019
There isn't a lot of info around on that model. It might be worth reaching out to the manufacturer to see if they could provide the tank code.
Verified Answer
Hello I need a replacement tank for a Carvin Bel air 212 the model number is 9GB2C1B from Accutronics. Please let me know the exact replacement that will work for this amp.
Answers (1)
MichaelT
Staff Member
March 22nd, 2019
The highest input impedance we have is F. We don't have a compatible tank for the 9GB2C1B.
Verified Answer
Replacement for a short tank 2EB2C1B on a monoprice 1x12 15watt amp?
Answers (1)
MichaelT
Staff Member
April 3rd, 2019
We have a three spring 8EB2C1B which is compatible with the tank you listed. We also carry a 8EB3C1B which is the same thing but with a long decay and the 8EB1C1B which has a short decay.
Verified Answer
How different do the long, medium, and short tanks sound?
Answers (1)
MichaelT
Staff Member
April 15th, 2019
Check out this video comparison! https://youtu.be/ZNHZEQRDOOI
Verified Answer
I want to replace the Accutronics reverb tank (4BB3C1B) in my Ampeg VH140c for the most lush/ambient/big sounding reverb tank possible. Which one should o choose?
Answers (0)

No answers yet!

Replacement tank for Traynor YCV50 Blue 50w 1x12 Combo
Answers (1)
MichaelT
Staff Member
April 15th, 2019
That amp uses a 4EB3C1B.
Verified Answer
I'm looking for a reverb tank for a Crate Vintage Club 20 amplifier. The original tank was a Belton two-spring short-tank--the only designation that I can see on the tank is a small sticker that reads "70-222-01". Is there any tank, exact or close to it, that will work for this amp? Thanks!
Answers (1)
MichaelT
Staff Member
April 15th, 2019
The schematic lists a tank with a 1k4 input impedance and a 4k output impedance. We do not have a take that matches these. The closest tank we carry is the 8FB3C1B but we have no way to verify that this tank will work in the amp.
Verified Answer
What tank will work best for my 1966 magnatone mp-3? Im looking for a drippy 60s dick dale reverb.
Answers (1)
MichaelT
Staff Member
April 15th, 2019
From the schematic floating around online, this amp has a reverb driver transformer with an 8 ohm secondary. I'm not sure if it will definitely work but the first tank I would try is the 4AB3C1B. This is the standard tank used in Fender amps which as also use reverb driver transformer with an 8 ohm secondary. It's also the same tank in their stand alone reverb unit which is what Dick Dale used.
Verified Answer
I want to build a stand-alone reverb using the smallest power supply possible. What are the requirement specs for your smallest reverb tank?
Answers (1)
MichaelT
Staff Member
April 17th, 2019
Your best bet for a small power supply is going to be a solid state circuit. The smallest tanks we sell are 9.25" length x 3.375" width x 1.313" height. These come in a variety of different impedances and grounding schemes.
Verified Answer
I see that the short tank 8EB2C1B is for a Fender Vaporizer. It has and Input Impedance 800 Ohms, Output Impedance 2575 Ohms. The 9EB2C1B has the same impedances, in a 16.75" long spring size - is this unit interchangeable? Is there any benefit from the long spring unit vs. short?
Answers (1)
MichaelT
Staff Member
April 17th, 2019
The 9EB2C1B will work in place of an 8EB2C1B. I would suggest making sure there is enough room to fit the larger tank. The differences can be hard to describe but a lot of people think that the full sized tanks sound bigger and airier than the small sized tanks. You can also pick a tank with a different decay time to alter the sound. 8EB2C1B and 9EB2C1B will have a medium decay length whereas the 9EB3C1B will have a long decay length.
Verified Answer
I have a 1954 Magnatone Varsity 108 and it needs reverb. Which tank do you recommend, and could you provide a parts list and schematic/wiring diagram for this modification?
Answers (1)
MichaelT
Staff Member
April 22nd, 2019
We don't have any kits or instructions for adding spring reverb to an amplifier without a reverb circuit. This type of modification is unique to each amplifier, can require quite a bit of custom circuitry and often would require a new power transformer or the use of multiple power transformers. A stand alone spring reverb unit or a spring reverb pedal is a much easier/cheaper solution to get reverb with an amp.
Verified Answer
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.
Verified Answer
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
Answers (0)

No answers yet!

vox ac15 newer amp what tank?
Answers (1)
MichaelT
Staff Member
May 28th, 2019
The AC15C1 uses an 8EB2C1B.
Verified Answer
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
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