[sdiy] How do reverb tanks work?

[Travis Shire]

> Thanks Dave -
>
> ahh, here's typical drive current values, too:
> http://www.accutronicsreverb.com/ioic.htm
>
> So ... they only drive them with 8mW !
>
> I wonder why there are guitar amps then which parallel two systems of a
> 12AT7 to drive a reverb tank ....
> Without actually having calculated such a tube stage, I'd had expected
> something in the 100mW range,
> at least ...
>
> Maybe these 8mW are typical rms values, not peak level ...
>
> JH.

Ampeg used a 6fq7 r/c coupled for drive. Some amps used a 6V6 w/transformer,
as well as the old outboard Fender reverb unit. Some low end rolloff at the
drive section makes them sound less "springy", but some cats go for that
*boing*.