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No hiss at all on empty channels. I'm sure it's down there with the rest of the missing audio. I only got weak audio by drastically misadjusting a couple of the tuning slugs at the very end of the IF strip (nearest the 6AL5). I have no audio at all, presently.
I don't know if the new signal generator is modulating FM. One would think that would matter. I'll play with it some more and find out.
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