Quote:
Originally Posted by Captainclock
Yeah, I kind of figured as much, but wasn't sure. Anyways the 12AT7 tube I put into the radio was a Telefunken tube (which is of extremely high quality) which is probably why there's hardly any drifting of the FM dial, I have not been able to locate a service manual for this radio and because of that I have no idea what purpose each tube serves in the radio (the little tube placement guide on the bottom of the radio doesn't list what each tube does in the circuit for some reason.)
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Zenith made that same chassis for several years with just slight variations.
The first models that were changed is when they put the volume control on the left side.
The eight tube models were considerably different, AFC using a separate tube, tuned RF stage on both AM&FM, two stages of AM IF and larger speaker and two types of tweeters.
I have several models of all their AM-FM models, built through the years.