Re: AVO 8SX? + Service manual?
1. Leaf switches blackened, worn or gone out of adjustment? This has been covered recently so a quick search back through this part of the forum will show some guidance.
2. I was surprised to learn (that on a MODEL 7 at least) that a fault in the transformer can disable ALL the AC ranges, not just the AC Current. I wonder if Model 8 derivatives are similar.
3. Check that the cam rotors on the rear of the rotary switches haven't come loose. Hope it's not this as one of them is inaccessible- the transformer is in the way.
4. Rectifier may be leaky or corroded.
5. Dry joint/s?
Dave
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