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 Post subject: RCA 67QR73FM-3 1956 German Radio Question
PostPosted: Nov Mon 13, 2017 11:19 pm 
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Joined: Aug Sun 23, 2015 6:01 pm
Posts: 512
Location: South Jersey East of Philly
I am working on this 67QR73FM-3 RCA 'German' radio, made by Graetz possibly for USA servicemen. The radio is working fine, but I noticed after buying it that the FM dial scale goes from 88-100Mhz. I've seen this in other German 1950's radios...but on this one I am receiving from 92-108Mhz stations. I haven't touched the alignment. If anyone has worked on these---I am curious if they were capable of tuning beyond the 88-100Mhz range since it was made with RCA in mind...or maybe the oscillator can be tweaked to do what is doing now AFA reception beyond 100Mhz.
I don't see any schematics out there that might indicate some info on this radio. Here's a pic of a similar one's dial scale...
Image


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 Post subject: Re: RCA 67QR73FM-3 1956 German Radio Question
PostPosted: Nov Mon 13, 2017 11:52 pm 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 3513
Location: Near Brandon, Iowa
The "American servicemen stationed in Europe" seems like a good guess, since not only is the FM band capped at 100 MHz, the radio has standard broadcast (MW) European station place names (useless outside of Europe), and Longwave band capability (again, of little use outside of Europe). Yet the pushbuttons are labeled in English.

This may have been a attempt by RCA to pick some "low hanging fruit" given the number of American military personnel stationed in Germany in the mid-50s, since it would have only been necessary to create a slightly modified silkscreen to manufacture this model, the European version of it (sold under the Graetz label, presumably) being already in production.

Most of these FM-range-capped radios can be retuned to cover the high end of the FM band, at the expense of the low end. AFAIK the FM tuner for the export sets which covered the entire FM band was a different unit and not simply "retuned". At least, that's the case with other German sets that I've repaired.


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 Post subject: Re: RCA 67QR73FM-3 1956 German Radio Question
PostPosted: Nov Tue 14, 2017 12:31 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 2814
Location: Mountains of Mourne. Ireland.
Schematic: https://www.radiomuseum.org/r/graetz_scerzo_m531.html

Greg.


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 Post subject: Re: RCA 67QR73FM-3 1956 German Radio Question
PostPosted: Nov Wed 15, 2017 2:04 am 
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Joined: Aug Sun 23, 2015 6:01 pm
Posts: 512
Location: South Jersey East of Philly
Great, thanks for the link Greg! Now I just have to find an cheap EM34 eye tube... :lol:


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 Post subject: Re: RCA 67QR73FM-3 1956 German Radio Question
PostPosted: Nov Wed 15, 2017 2:50 am 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Bob has a 6CD7 (2 ranges, 2 shadow angles) used for $15.00
http://findatube.com/

Greg.


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 Post subject: Re: RCA 67QR73FM-3 1956 German Radio Question
PostPosted: Nov Wed 15, 2017 6:36 am 
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Joined: Aug Sun 23, 2015 6:01 pm
Posts: 512
Location: South Jersey East of Philly
Thanks for the tip on the 6CD7 tube Greg...I had to order some EL84's anyway, so I'll get them from Bob.
I was able to get the whole FM band--88/108Mhz dialed in...just have to ignore the dial markings of 88-100Mhz.


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