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Eico HF-35 filaments, hum, grounding, etc.

Posted by D. McAllister on August 5, 2013 at 19:06:58:
Michael, I've put all new tubes and all new filter caps (electrolytics for now, but they're all new.)

This gives me a few ideas. I'll A/B the tubes and check the sockets and also all the ground solders.

A clue here: the hum gets loud on startup and then goes quiet. You can still hear it though. Level control doesn't affect it. Almost sounds like a capacitor.

Thanks.