Philco Predicta predicament

[ShartZenith]

Yes, it does buzz or hum whenever some text comes on the screen when I prompt it from my converter remote, i.e., sound volume adjustment, signal strength. It always will if the program changes from the current view to a commercial or even between different commercials. When it goes back to the regular program feed is settles down almost immediately and the buzzing/humming ceases. It also tends to buzz right when I turn the set on until I adjust the tuning knob behind the channel selector back and forth slightly. It's a model H3410L. Not sure of the chassis number. It's behind the back cover I think and I'm running it at the moment and don't want to shut it off. Should be one of these three according to the schematic we used, 10L41, 10L42, 10L43.