Marshall Super PA pt. 2 (Distortion in Tube Amps)

Sometimes the distortion is less than desirable.  Sorry, this is sort of a technical one, I'll elaborate more when I get some time (if you understand, you understand).

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Marshall Plexi Super PA 50w, 1960's

Symptoms:  mild, background distortion as the note decays, somewhat like a blown speaker.
Power Tubes:  New Version Mullards