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Finally!
Well, I pulled the chassis out tonight and decided I'd zero in on those ceramic capacitors I had mentioned before. I replaced that questionable 2 x .01 ceramic capacitor coming off my sound discriminator and found a .001 ceramic on my 6AU6 that had a bubble in it. I replaced the first with two .01 film caps and the .001 with another film cap and finally got everything back together.
The good news... is that this really made a difference. I think it's quite likely that the 2 x .01 was indeed open. I'm not sure about the .001 but I'd imagine it didn't hurt. While a few channels are still rather buzzy and distorted, the buzz is mostly eliminated or at least can be dialed down somewhere between the buzz control, fine tuning, and A.G.C delay. Channel 3 is still pretty hopeless, but I switched my RF converter to channel 4 and used that for my DVD input and I was able to watch Jack Benny without much disturbance at all. I have to turn the A.G.C. really low before the buzz becomes apparent and by then, the picture is breaking up.
I'll be sure to post a new video tomorrow on YouTube. With any luck, after making some adjustments and perhaps replacing a couple other small components, I might be able to wrap this project up!
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