MARK IV volume raise

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dan_the_man

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Joined
Nov 30, 2020
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Hi,

I use my Mark IV/A head everyday and I've been experiencing a little issue with volume since a while.
I usually do this:
turn on, leave it in stand-by mode for few minutes (4/5 to even 10 while doing other stuff) , then stand-by off and kick off.
From the very start to let's say about 45 minutes of usage, the overall volume (this not affects gain) raises quite a bit, a differenc of about 9 to 11db measured with a meter.
My amp always begun plays better when properly warm up, I read somewhere here on this forum is something boogies are known for, but never happened this volume climax before.

Does anybody experienced the same?
What could it be?
 
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