I just bought a Marshall DSL401 second hand and love the tone I get with it and my Gibson LP Standard.

The only annoying thing is that the volume of the amp keeps fluctuating from low to high....

Is this a sign it needs re-tubing????

ANy help would bne appreciated.. Thanks..
keep a fan on the tubes keep it as cool as possible if it keeps happening replace them but make shure to keep a fan on them
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later that night