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Ashdown Peacemaker P60 valve combo, 2003

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 on

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Reply to
N_Cook
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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

Reply to
hrhofmann

facia

ventilltion

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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

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Reply to
N_Cook

You might consider adding a small DC fan. A 12V fan running off a diode and capacitor off the (supposed) 6.3VAC heaters will be running relatively quietly at V.

Reply to
Ancient_Hacker

I'd half considered a fan but there is no obvious place to put it and without cutting a hole in the steel chassis or the wood cabinet it would just be circulating the air, unless mounted outside the chassis , directed over the bottles. Good idea about the heater supply use.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

How about "tube coolers"? I've never used them, but if there's no room for a fan...

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Reply to
Sofa Slug

They could get the heat away from the tubes, but it'd still be in the box. By themselves, they'd probably make little difference.

Isaac

Reply to
isw

would

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Unfortunately I cannot contact the owner , no replies so far. I intend cutting a 3 x 2 inch hole in the cab top , masked with grill. Positioning it asymmetrically off-centre in both senses so above the big bottles and clear of internal encumberances so a 2 inch fan could be fixed under the grill , later, if required. And the pcb perforations pf course

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

If there is not a corresponding hole in the bottom, or the bottom of the rear panel, you should do that too. Convection can do wonders.

Isaac

Reply to
isw

EL34 bases are 15mm diam and the metal chassis holes 45mm so plenty of airgap there, but absolutely no holes through the valve bases or pcb.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

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