Popping when switching wattage but not channels

[iamrobk]

Hey everyone, on my Mark V I get a loud pop every time I switch from 10w mode to 45w mode, with a slightly less loud (but only slightly) pop when I switch from 45w to 10w. No popping when I switch channels at the same wattage, or go from 45w to 90w (or vice-versa). It'll pop when switching channels if going from 10w to 45w/90w (or vice-versa). Recently switched the power tubes from 6L6'c to EL34's and problem is the same. I mostly play at home so it's not really a problem, I just want to make sure my amp is ok! Could a dirty tube socket cause this? I'm guessing it would be V9, because that's the only tube active in both 45w and 90w mode but not 10w. This has happened plugged in at different houses/etc. so it's not a problem with the power it's getting.

 

[Jeronimo]

Hi, it's absolutely normal that you hear the popping sound when switching between 10W and 45 or 90W or when switching between channels when one is at 10 at the other on 45 or 90 W.

This is in the manual:

NOTE: The 10 Watt Mode is not really intended as a viable part of the Footswitching matrix of the MARK V due to its limited volume
capabilities. While it is plenty loud to play with others, there are huge internal voltage changes that occur when you switch to - and
back out of – the 10 Watt setting from the other two power settings (90W & 45W).
These voltage changes across the power tubes and related power supply create noise (pop) during the instant that the voltage is chang-
ing and though there is an entire circuit that mutes many places in the signal path, this pop is still audible. If you insist on switching
between some Channels that are in 90 Watt or 45 Watt and others that are in the 10 Watt Single-Ended mode, you will have to overlook
the “pop” in favor of achieving the exact sound you need. This is unavoidable, normal and will in no way hurt your amplifier.

 

[iamrobk]

Derp, wow, not sure how I missed that!

Thanks!!