Pye P43 overheating.

[Jimboey]

Originally Posted by Glowing Bits!

Looking closely at the pics, the black staining appears to be primarily in the centre of the chassis, this would suggest possibly high heat build-up from the valve bases, I have seen this before.
A pic of the chassis top would help further with this investigation.
I would agree with others regarding coil devices, I always check trannys first, then valve checks.
Any tranny needing a rewind can be sent to Ed Dinning, whilst he sorts it out, it buys time to replace knackered components.
Hope the above helps the OP to get things up and running.

Hi I removed the valves one at a time and only valve 2 looks black and sooty inside the valve holder

[Glowing Bits!]

The black holder looks to be a paxolin type, these usually discolour over time due to heat from the valve.
Looking carefully at the pics, it looks like a combination of dust and smoke residue, smoke residue contains carbon, it is conductive.
The best thing to clean this would be either IPA or meths.

[vinrads]

I don't have a problem spraying under the chassis with WD40, you may need to leave it to soak in for a while , or if you can get it I use diluted Acti wash it's ,powerful stuff, dabbed on with a 1" paint brush ,leave it to do it's work .clean off with warm water in a hand held spray, then left to dry near a heater , picture of an amp I rebuilt some time ago. Mick.