Hi everyone,
Hoping someone has some knowledge of what the black markings (burn marks?) are at the base of this vacuum tube. I have a number of tubes with similar looks around the pin bases.
Hoping someone has some knowledge of what the black markings (burn marks?) are at the base of this vacuum tube. I have a number of tubes with similar looks around the pin bases.
Looks like some sort of chemical reaction with the tube pins.
Clean it off with a brush and alcohol.
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