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Old 2nd October 2010, 04:07 PM   #1
arhi45 is offline arhi45  Romania
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Default RFT tape recorder

Hello all,
I bought a tape to tape reel recorder adapter made by RFT (German Democratic Republic) in 1956. It must be placed on a 78 rpm turntable with the backside- see picture 21. Everything seems to be Ok, even the filter capacitors, but I don't have a turntable anymore. How can i replace the turntable and the drive? I mean in a simple way, of course. Many thanks.
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Old 2nd October 2010, 04:11 PM   #2
arhi45 is offline arhi45  Romania
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another picture, the selenium rectifier
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Old 2nd October 2010, 04:14 PM   #3
Pano is offline Pano  United States
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What a novel idea! So the turntable served as the motor for the tape unit? Can we see a photo of the other side where the tape goes?

Seems to me the easiest way is to get a turntable with 78 RPM. Other wise you'll have to build a motor drive at the right speed.
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Old 2nd October 2010, 04:16 PM   #4
arhi45 is offline arhi45  Romania
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wait please, I can't attach files
Hope it works....
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Old 2nd October 2010, 04:19 PM   #5
arhi45 is offline arhi45  Romania
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I could not find a 78 rpm turntable good enough to work. Only 45 + 33.
the back side....and tubes, 2x ECC81, working.
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Last edited by arhi45; 2nd October 2010 at 04:26 PM.
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Old 2nd October 2010, 04:23 PM   #6
Pano is offline Pano  United States
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Merci pour les photos!

Too bad you can't find the turntable. Many old turntables here in the USA have 78 RPM.
This little unit is so cool it would be wonderful to get it working. Maybe someone here can help with parts or ideas for a custom base and motor.
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Old 2nd October 2010, 04:46 PM   #7
arhi45 is offline arhi45  Romania
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I think, 'm not sure, that with a 78rpm the tape recorder speed was 19cm/s. I don't know the frequency range at that speed but I'm asking myself if the 45rpm wolud not give a 9.5cm/s speed for the recorder.
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Old 3rd October 2010, 04:48 AM   #8
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No, the ratio isn't quite right.

Looking on eBay in the USA there are quite a few 78 RPM turntables for good prices. They would not work in France because the the 50/60Hz difference. They would run slow.
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Old 3rd October 2010, 01:23 PM   #9
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There was a later machine called a Gramdeck based on the same principal of the 78 rpm turntable. It was transistorised, if I remember rightly and may not have been sold much outside the U.K.
The strength of this principal is the fact that most 78 rpm turntables have negligible wow and flutter, due to the flywheel effect of the large turntable. If you drive it any other way you will still need a large flywheel to make W & F acceptable.
It will work at 45 rpm but you will have non standard speed recordings that will only playback on the same unit. Frequency response will also suffer and it may not have been that good in the fist place on a 1956 machine.
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Old 3rd October 2010, 02:38 PM   #10
arhi45 is offline arhi45  Romania
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I found the "gramdecK" here: No title
Very nice !
An electronic stabilized speed drive - don't you think is doable ? I don't know what kind of motor...but I could build an electronic stabilizer, I think.
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