Should I change out original 41 year old screen grid resistors on a 1984 Marshall?

H

harddriver

Well-known member
I don't see signs of excessive heat and they both test fine...984ohms and 976ohms....I know these things take some abuse over time.

I have new Welwyns's here ready to go....I figured since I am already into this amp rebuilding it....why not???????????

Should I go with the if it's not broke adage or just install some new ones for peace of mind?
 
dead-pan said:
Measure them.

I had a single tube take out one. The amp sounded fine. So....
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Exactly. My 71 JMP didn't need changed, but I did the signal caps and a few other from my stash. That 50w is a beast.
 
Why create more work if they are not fried. I'd wait till I was at least doing a retube of the power section.
 
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