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Yes, I believe "Audition" was a house brand for radios sold by F. W. Woolworth, Kresge, and other discount stores of the sixties. I remember seeing a few of these sets in a Woolworth's store near where I grew up.
The Silvertone AM/FM radio with weak AM and dead FM may have a weak tube; I'd test them and replace any weak ones. (I'm not a fan of "shotgun" tube replacement, but in this case it could help matters as far as curing the problems with both AM and FM goes.)
The FM RF amplifier tube could be defective, even if its filament lights up as it should; this can happen if the tube has an open cathode, for example. I'm not sure if the FM RF amp in radios like the one being discussed here is used on AM as well (as a converter stage), but if it is, a new tube would improve the AM reception and likely would restore the FM. I'd try replacing the tube first before doing anything drastic under the chassis, as around 80 percent of all problems in tube-type radios are caused by weak or dead tubes.
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Jeff, WB8NHV
Collecting, restoring and enjoying vintage Zenith radios since 2002
Zenith. Gone, but not forgotten.
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