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I've got both an AA (10", 1977) and an AC (13", 1983) chassis. The AA has a wonderful picture in spite of the coarseness of the picture tube, and from 6 feet away it doesn't look all that bad. It's been around as long as I can remember - it was my grandparents' kitchen TV and then it rattled around my parents' house for quite some time. It got back to me after it quit working as Dad's barn TV. Took a lot of cleaning, a fuse, and a damper diode to get it presentable again, and I'm still chasing bad solder joints here and there.
The AC was a $3 thrift-store purchase in hopes of nabbing the damper diode for the AA, so I can't vouch for its picture other than 'the screen lights up'. When I get around to putting a Mouser order together for some other projects (including the dead Admiral in my living room), I'll splurge and get both of them a fresh diode.
Have the same problem as the OP mentioned; on a white screen I can see a very slight hum bar, and when the air kicks on, the picture sucks in for a second or so. Guess I'll have to change the cap out someday. The service information in the compartment on the back is a great thing; it's nice to be able to open one up and have all the vitals at your fingertips.
-Jim
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