Found an early 1950s Zenith AM/FM Clock Radio at Goodwill today!

[dieseljeep]

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.)

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.

[Captainclock]

Originally Posted by dieseljeep

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.

Mine does have an RF stage for both the AM and FM (according to what information I found on the internet at the Radio Museum website.) Anyways like I said unless it was just that the ink was smudged on the date stamp on the top of the radio chassis the date stamp dates the radio to 1962 (which could also be 1952 as well if the date is just smudged.) I guess that the radio having an RF stage would make it more sensitive/selective than a comparable radio without an RF stage, which would explain why the FM band on my clock radio just lights up with stations all over the place with just the built-in line antenna.