Pop sound after 1:30 minute

[Rawk777]

My MP2 started to make a pop sound followed by a volume drop and back to normal again. The pop seem to always happen about 1.5 min after the unit is turned on.

Any clue on what is going on?

[Iperfungus]

Did you swap the tubes already?

If no, swap both with new ones.

[Rawk777]

Did you swap the tubes already?

If no, swap both with new ones.

New tubes did not fix the problem.

[rnolan]

Seems something is not working until it's heated up/stabalised, but what  :dunno: , a pop sounds like a capacitor that needs changing, again which one  :dunno: , although doing them all is a good idea if you are up for it, at least the MP2 noise mod (21 caps).