Marshall 50W Mater Volume Model 2204

[J Luth]

It needs some minor work but the guy that owns it would like to do a mod.

He wants to know if it would be possible to put a Fender AB763 or other style style reverb circuit in this amp. He doesn't want to use a reverb pedal.

If possible, where would be the best place to connect the input and output of the reverb circuit?

Would need to make a small board for the circuit add the tubes, transformer, pot, reverb pan, cables and jacks.

Would probably add a small filament transformer also just to be safe.

[Chuck H]

I would probably use SS circuits parallel to the dry signal and take/insert right behind the master volume. Think about it. You don't need tubes to make reverb and it's an "effect" so only adjacent to the amps tone. Doing it with tubes will probably require more dry signal padding and detriment than with an SS circuit. For that matter I wouldn't even use a tank. I'd use a digital "brick". This because I'd be trying to preserve as much of the amps dry signal chain as possible. That said...

This doesn't come up much and whenever it has there hasn't been many good solutions. That amp model doesn't lend itself to an easy, stuffed in DIY reverb addition. Another option:

I built an amp for a customer that also doesn't lend itself to an added reverb and was idealized for good cranked overdrive tone. He later asked about reverb. So I built him a reverb combo amp that filches about a watt from the host amp to drive the reverb tank and then the combo amp provides the reverb signal (with it's own power amp and speaker). The neat thing about this is you can locate the reverb amp anywhere a cord allows for spacial effect. He really likes it.

[J Luth]

Thanks Chuck