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Amp ho
Looks like you still have the original 5000pf Lemco bright cap as well and it still has the Red dogbone 500pf caps in the tonestack and the 470K mixer resistor cap for the bright channel.
Looks like someone probably installed a PPIMV at some time in the past and somebody returned everything to stock in the PI circuit which is why the Iskra resistors are swapped out to newer carbon film in the PI as well as the .022uf Sozo coupling caps. As MGL stated for originality sake you can have NOS Mustards installed there in the PI but I probably won't sound much different but it will be up to you down the road.
You never did say....does this amp still have original power and output transformers?
man great info. Seeing those sozos where mustards should be did annoy me at first. Will likely replace them eventually.
The transformers… PT appears original. OT is interesting as it doesn’t have the typical code. I was initially thinking it was replaced but after doing a little research I’m not sure. OT100 M OT’s appear to pop up on Marshall’s going back into the late 60s. Know anything about them?
Check out Obeid Khan’s posts regarding the OT100M and OT50M:
https://www.thegearpage.net/board/index.php?threads/69-marshall-tranformer-info.1005880/
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