Got this free with some other stuff I picked up. It was going with me or to the tip. Weighs about 20kg. Full aluminium and steel chassis dating back to about 1978-1982ish by the looks. Very over-engineered. Massive laminated transformers, huge capacitors, more heatsinks than I've ever seen on anything. Totally rock solid. The underside, not pictured as I can't turn it over at the moment, has a couple of preamp boards and driver boards in it. I have some paperwork that suggests it's a JLH class AB.
Also missing bleeder resistors which scared the living excrement out of me when I probed it after a shut eyes behind safety glasses, stick fingers in ears and assume the crash position power up. Unfortunately the entire thing is beyond repair by the looks. I traced some of the circuits and there are a number of scary things in there which I don't have time to resolve including some grounding issues and quite frankly scary dangerous AC wiring.
Inside:
More inside
Nice old electrolytic. ESR is still within reasonable limits. My wife hasn't noticed the new window ornament yet
So what to do with it? Caps are good. Transformers are good. The chassis is good and the heatsinks are good. I haven't extracted the power transistors yet but I assume they are good. Seems a shame to sling it.
Option 1 - monster bench power supply. If I cut the chassis into three and knock out a simple linear supply with an LM327 something in the middle with current gain and existing power transistors as bypass transistors. Reuse the existing caps, rectifiers and sink resistors as well. I haven't worked out the transformer VA but they push at least 80v RMS by the looks so that's a good bet for a 50v @ 5A supply. 250W of destruction.
Option 2 - any ideas?