Here is an ugly one! A Musicman HD-130 head shoved into a Fender Super Twin cabinet with the original all too heavy Super Twin speakers! Easy repair: blown tube. Change it and re-bias. Customer had 3 original Sylvania 6CA7 tubes that were well used and....they tested great and still worked. This was a 'keep it cheap' repair so I put 2 of those in and left 2 of the Electro Harmonix ones in there. They actually were very close to matching. Anyway, amp is making music again! This is one with the solid state phase inverter. Biasing is easy but do not attempt this if you have no experience. These babies contain a lethal 700 volts DC. Stay out of that kitchen and let a pro take care of you.
Other work: I did clean up the cabinet. Re-glued the tolex etc. I get a little OCD about that. Lipstick on a pig? Sure. But the best rock n roll ain't pretty! I love me an ugly amp!