The seven digit reverb tank code determines its compatibility with different amplifiers and devices. While much of it cannot be changed, there are two designations that can be altered while maintaining compatibility. These changes give users the option to choose the type of sounds they want from their reverb tank.

The first digit designates the size and spring count of the tank. While each style sounds great in any amp, the different sizes and spring counts each have their own distinct sound. Mod tanks offer a short styled tank with three springs (first digit 8), a full sized tank with two springs (first digit 4), and a full sized tank with three springs (first digit 9). As long as the tank will fit in the device, the size and spring count can be changed while maintaining compatibility.

The fourth digit designates the decay length. The short option (1) is 1.2 to 2.0 seconds. The medium option (2) is 1.75 to 3.0 seconds. The long option (3) is 2.75 to 4.0 seconds. These times can vary depending on the circuit used but will maintain a relative difference to one another. Users may find that the different decay lengths work better for certain sounds. Changing the decay length does not affect compatibility.

To view and compare compatible Mod Reverb Tanks, please enter your Reverb Tank code in the form above. This code should be in a format similar to 4AB3C1B.