On Oct 18, 3:13*am, "N_Cook" wrote:
I discovered how to get into it, remove front knobs etc and remove the facia
panel first.
This amp runs very hot in the region of the EL34 output valves, almost to
the
point of charring the pcb, localised black rather than just brown
discolouration. The valves are inverted and no ventillation path
under or around the valve bases. There is plenty of space to mill holes in
the pcb around the periphery, and avoiding traces, to allow some ventilltion
through. Anyone done this before or aware if it actually reduces localised
heat build-up ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/

You have demonstrated a good practical diagnosis many times here, go
for it. Too many of those amps were designed by engineers who never
got to se the final product in operation and had little or no common
sense.

Bob Hofmann