DC3 Problems

[jestaudio]

Been using my DC for rehearsals the last few weeks and noticed some issues,
The channel switching is noisy with a distinct pop from dirt to clean
I have what sounds like DC on the guitar volume on the dirt channel
Intermittent crackles and reverb dropping out.

I,ve tried the usual before opening it up, new tubes etc, no issues with the guitar through my other amp
Anyone got some bright ideas
Many thanks

 

[Monsta-Tone]

Don't know if this has been fixed yet, but it sounds like a leaky coupling or tone stack cap.

I had a Mark IV that would pop when changing channels. It also made loud crackling sounds when I would turn the lead channel tone pots.
Turned out to be leaky treble and midrange caps in the tone stack. Good thing I didn't touch the chassis while turning the knobs, each one of them had over 200 volts DC on them!

 

[BlackBoxy]

agree with monsta, seems at some stage a cap is ground leaky