On Nov 15, 6:00*pm, Meat Plow wrote:

There is much more in the drive circuit than valves. There are a
couple FETs an op-amp, zener diodes, caps etc... All of which could
and probably are responsible for that motorboating.

I could track this down in 10 minutes or less with that schematic and
my oscilloscope but you my friend and fellow guitarist haven't a
snowball's chance in hell with this repair.

Well, thanks for that vote of confidence ! ...but I *will* fix
it. ..of that I am certain.
I've successfully repaired many things 'remotely' with the help of
kind folk like Sam Goldwasser.
This is only an amplifier after all.

Here's a web page with some of my gear;

http://s273.photobucket.com/albums/j...atplow1/music/

Err...Ok..... Thanks.