Hey there Headsmasher, Any luck with your DR? I've taken a bit of a break from mine, playing the 800. I have also suspected the OT but don't know how to test it.

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