An old 1960’s Ampeg B15 Portaflex in the shop.
Bad rectifier tube, and lots of corrosion, causing bad pin-to-socket contact. Also, someone in the past had mucked-around with the cathode bias resistor (and messed things up, the output tubes were roasting hot).This one needs a lot of clean-up work…but for now, the owner needs it tomorrow. So, bring it back to life, and get it ready, even if not up to it’s 100%, for the gig!
Check out the power supply and output transformers. Huge!