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I took the lid off to observe only and noticed how those notorious cards could move around... DC offset is < 3 mV each side. Sure would be great if it's just a bias transistor because it's playing music great for the short time it can stay running.

I have a new-to-me Phase Linear Model 300 Series Two that I purchased on eBay as testing/working. Cosmetically very clean, original caps. When I plug it in, it emits a humming sound from the amplifier and plays clean stereo audio but one of the two heat sinks heats up to 220F within a couple of...