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Ashdown Peacemaker P60 valve combo, 2003
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N_Cook
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Posts: 5,247
Ashdown Peacemaker P60 valve combo, 2003
hr(bob)
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...
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
Scraping back some of the pcb surface browning and into the bulk of the pcb
material , the browning extends the depth of the material. Also some brown
staining on the surface of nearby solder points, probably some vapour coming
off the polyester and settling on the solder. No ventillation grill in the
cabinet top either.
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
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