| They might for a short time when first turned on.
they also might if you switch the switches while playing.
other than that, neither one should make a pop of any significance.... both have discharge resistors to prevent it, in fact.
The mute can pop if the mute FET is leaky. Dunno about ultra-high, it's pretty straight-forward, and shouldn't pop. leaky capacitor can do it, but two pop problems on one amp is somewhat of a co-incidence..
__________________
Yes I USED TO work for Ampeg...but I haven't forgotten everything.
| 
