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From The Radiotron Designer's Handbook (a.k.a., the bible):
Black -- grounds, grounded elements, and returns
Brown -- heaters or filaments, off ground
Red -- power supply B+
Orange -- screen grids
Yellow -- cathodes
Green -- control grids
Blue -- plates
Violet -- not used
Grey -- AC power lines...
Yep. Can be done without too much trouble. When you make the new baffle board, though, you will need to move the speaker over to one side to get the necessary clearance. Cut the baffle board to size and then place it in the amp. Get the speaker you want to use and position it in the best...
Have you checked the continuity of the switches with an ohm meter? It's pretty straightforward wiring so my guess is that there's a breakdown in the switches themselves or somewhere in the other connections/cable.
Who did the tube change? Anyone check the bias and the bias circuit?
That "loud buzz" is the power transformer drawing too much load due to a short.
Does this amp have a tube rectifier? If so, pull it and try again. Report back.
I don't know how easy it is to work on this amp, but I would...
This. I've rebuilt a few of these for friends who gig a lot with them and agree wholeheartedly with the above. Once you do that, you have a much more reliable and stable amp that will give years of service.