"assplode" - I'll have to remember that :lol: . Yes, I think you've covered the valves. The AX7s would be the likeliest culprits if you're not getting anything from pre-power outputs like the FX loop and DI out. Seeing as you've checked them, and the powers are glowing, I think you're right to tick them on the list.
This muting thing is completely out of my zone as none of my amps have the feature. If you do ask around on the PP forum, you could try the "Marshall" category, but make sure you put a thread in "Tubes transformers and components". The latter cat has more of the solder monkeys and may get you a useful response sooner.
"assplode" - I'll have to remember that :lol: . Yes, I think you've covered the valves. The AX7s would be the likeliest culprits if you're not getting anything from pre-power outputs like the FX loop and DI out. Seeing as you've checked them, and the powers are glowing, I think you're right to tick them on the list.
This muting thing is completely out of my zone as none of my amps have the feature. If you do ask around on the PP forum, you could try the "Marshall" category, but make sure you put a thread in "Tubes transformers and components". The latter cat has more of the solder monkeys and may get you a useful response sooner.