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Ampeg PF20T tube cover

As a recent purchaser of a PF-20T, I'm curious. How often are you needing to take the cover off get into the tubes?

Should not need to unless you have a tube issue or are into swapping in vintage tubes. I removed mine 3 times. Mine was PF50T not 20, but basically the same thing relative to your question.

Once to fix a spring vibration in a tube retainer, once to swap in vintage tubes, once to swap back to stock before selling the amp.
 
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Should not need to unless you have a tube issue or are into swapping in vintage tubes. I removed mine 3 times. Mine was PF50T not 20, but basically the same thing relative to your question.

Once to fix a spring vibration in a tube retainer, once to swap in vintage tubes, once to swap back to stock before selling the amp.
Thanks. I'm hoping to not need to open it up.