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Before I could make the haziest guess, would want to see the schematic and know how old it is. If you have the schematic with voltmeter readings, the quickest thing to do first is check DC levels - troubleshooting isn't much different for transistors or tubes when you're starting from step zero, just different voltages expected and maybe different things commonly fail if you have the experience to know that chassis's foibles beforehand. As I said, I have no particular familiarity with this chassis, so would just have to go on general principles. If someone else on the forum has has seen this before, their suggestions would be much more valuable.
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