I have a vintage tube hifi integrated mono amp that I have adapted to use with an acoustic guitar. I have it hooked up to an old realistic speaker that a put a full frequency driver in.
I would like to add an effect unit like I see in PA systems, acoustic amps, or small mixing boards. At least reverb for some wetness. Does anybody know of a small circuit board unit that could be mounted inside the amp to add some wet effects and maybe run off the heater circuit voltage?

I would like to add an effect unit like I see in PA systems, acoustic amps, or small mixing boards. At least reverb for some wetness. Does anybody know of a small circuit board unit that could be mounted inside the amp to add some wet effects and maybe run off the heater circuit voltage?
