MOD® Reverb Tanks

The JC120 uses an 8AB2D1A.

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

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

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.

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

My 72 coupe head has an Accutronics 1EB2C1B fitted.

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.

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 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!

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.

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.

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.

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

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.

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.

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.

The schematic from 2009 for the Supersonic 60 shows a 4AB3C1B tank.

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

A 9AB3C1B will likely work in its place but I would suggest testing before fully installing to be sure.

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.

The schematic for that amp shows part number 064063 which is the 4AB3C1B.

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.

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.

The 8EB2C1B is the tank used in the Blues Junior.

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.

Yes. That is used to keep the springs in place when shipping but needs to be removed before installing the reverb tank.

The 4AB3C1C is the stock tank for that unit.

The 9EB3C1B works with the AC30C2.

The Deluxe Reverb uses a 4AB3C1B.

We don't have a way to verify this but the 8EB2C1B is mentioned online as the stock tank by users of this amp.

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.

The Hot Rod Deville uses a 4EB3C1B.

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.

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.

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.

The 79-201-02 tanks can be replaced with 8BB2C1B.

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.

The original 90s Blues Deville uses a 4BB3C1B.

The 8AB3C1B is a more common tank that is compatible. It has a long decay length rather than the 8AB2C1B's medium decay length.

Yes. If you search 8DB2C1D on https://www.amplifiedparts.com/ you will find this tank.

The 4AB3C1C is the stock tank for the 90s reissue version of the '63 Fender Reverb.