hiyas, that volume drop problem, i got same on a dual reverb. marshall no help. have you still had no luck finding out what it is? am gonna do some research, will let you know how i get on. i am suspecting output transformer!
kev
Hey man, got your snaps, sorry didn't get a chance to respond but I hadn't been around marshallforum for a while. Looks good and glad to hear it worked out well for you!
Keep rockin'!!