MOD® Reverb Tanks

Hey Alex! The Deluxe Reverb's have the 4AB3C1B. Some people like using the 9AB3C1B for a bigger sounding reverb too.

Hello. My name is Robert and wonder if this reverb tank is the best fit for my VOX TB35C1 TONY BRUNO COMBO? I´m looking for a "as close as possible" reverb sound as in the Fender Delux reverb RI. Thanks!

Hey we have various sizes that will fit different cabinets. Check out this page to see the dimensions for the different tank type. https://www.amplifiedparts.com/tech-corner/accutronics-products-and-specifications

The easiest way to identify the tank you need would be to check the original tank for the reverb code on the outside of the metal enclosure ie 8DB2C1B. If you no longer have the original you may want to search for a schematic or reach out to the manufacturer to see if they can help you identify it.

Typically when the 2nd and 3rd digits match the tanks can be interchanged. You'll want to verify that the size and mounting style will work for you as well.

Tank for '62 Ampeg Reverberocket vertical mount ?

The stock tank in a Blues Deluxe Re-Issue is the 4EB3C1B. Its really hard to pin down the difference since every amp is going to sound a little different but the 3 springs generally have a deeper sounding reverb.

Hey Terry. It looks like those amps had some variation in the tanks used. Does yours still have the original tank? Are there any markings on the chassis of the tank?

We don't have that exact tank but if you email us at info@modkitsdiy.com we can offer some suggestions.

Can you please tell me the replacement type is required for a Fender FM65R. Regards Bob

The 9EB2C1B is a 3 spring version of that tank. The https://www.amplifiedparts.com/products/reverb-tank-mod-9eb2c1b

It's always good to double check the stock tank for a code but the AC15's can generally use a 8EB2C1B.

That amp uses the 4AB3C1B.

The stock tank for that amp is the 4AB3C1B. For a medium decay you'd want the 4AB2C1B. If you want to go even shorter you could try the 4AB1C1B

Hey, Allen. The long 16.75" tanks will not fit into a stock Blues Jr.

The Blues Deluxe uses a 4BB3C1B and the Blues Deluxe Reissue uses a 4EB3C1B.

The Frontman 25R uses an internal spring reverb with no chassis and special connectors. We do not sell a tank that is compatible with it.

Yes the 4AB3C1B is the stock tank for that amp.

Can a tank from a Frontman 25 be installed on a Champion 30 amp that has absolutely no reverb at all. Digital bites. I like the tones of the tank. Thanks guys, I'm a drummer....haha, carry on!

That really comes down to the circuit around the tank. The same tank will sound different with two different reverb circuits. A good reverb drive and recovery circuit will sound great regardless of the tank required for it.

Does the current tank have a code on it? I don't see the stock tank listed anywhere.

Does the current tank have a code on it? I don't see the stock tank listed anywhere.

Every circuit is going to have its own unique qualities. If you're switching from a two spring to a three spring, here is a video that does an A/B on the sounds of a two spring and three spring tank. https://www.youtube.com/watch?v=Wg8hBVHEAqo

The Valveking 112 uses an 8EB2C1B. I'm not sure about that other amp. Is there a code on the tank anywhere?

The closest match we have to that is an 8AC2B1B. The differences are that this one is a 9.25" short tank rather than a 16.75" long tank as well as the decay length is a medium and the code you have uses a short decay length. Everything else is a match and should work electronically but you may find that mounting it will require some changes.

Hey Laurent. Unless mods are added to give the proper circuitry for reverb driver and recovery the tank won't do you any good. The tank is only a part of what makes spring reverb work.

This amp looks like it used a different kind of tank than the ones most vintage amps use. I can't find any solid numbers on the impedance requirements. It might come down to experimenting with different tanks to find what works best for it.

The JC120 uses an 8AB2D1A.

No, these tanks are spec'd very differently from one another.

Does the stock tank have any markings on it?

Hey Monty. I don't know of any tank that has those values. Are you sure the input and output aren't swapped? Is there a code of any sort on the stock tank?

Does your tank have a code on it? I've read about of people using a 4EB3C1B and really liking the results but I can't confirm anything since the schematic doesn't actually list the stock tank used.

The Blues Jr. uses an 8EB2C1B and the Blues Deluxe Reissue uses the 4EB3C1B.

That amp uses a 4AB3C1B. This is the tank used in most classic Fender amps. You can listen to a reverb tank comparison in this video to see how a MOD tank might sound in your amp. https://www.youtube.com/watch?v=c1IIiv89Qoc

Yes, the three spring and two spring tanks are interchangeable.

According to the schematic, that amp uses a 4AB3C1B.

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.

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.

We have a 9AB2A1B that is compatible with that amp. The tanks do not comes with RCA wires.

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.

We have the 8AB2A1B which should be compatible with that amp according to the schematic.

We have the 8AB2A1B which should be compatible with that amp according to the schematic.

Hey Bruce. I believe that amp originally had a Gibbs type C reverb tank. The 4FB3A1B is compatible with the type C tanks.

I'm not sure if it's an exact match but people report that the 4AB3C1B works and sound good in that amp.

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.

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.

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.

Here's a video comparing the short, medium, and long decay tanks https://www.youtube.com/watch?v=ZNHZEQRDOOI

Does the current tank in your amp have a code on it?

That amp uses the 4AB3C1B.

We have both. Was there a specific tank you were looking for?

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.

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.

I haven't been able to find any info on that amp's reverb. Does the tank have any markings on it?

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.

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.

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.

The original non-reissue Blues Deville uses a 4BB3C1B.

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.

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.

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.

We have a 9AB2A1B that can be purchased here: https://www.amplifiedparts.com/products/reverb-tank-mod-9ab2a1b

We don't have one that will fit inside as a replacement but have seen people modify their amps to connect to an 8EB2C1B.

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!

A spring tank needs additional circuitry to function in an amplifier. You might want to look into stand alone spring reverb unit or pedal.

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.

The highest input impedance we have is F. We don't have a compatible tank for the 9GB2C1B.