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telefunken: unknown Telefunken

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » telefunken: unknown Telefunken
           
Konrad Birkner † 12.08.2014
Konrad Birkner † 12.08.2014
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15.Jan.07 12:53

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Who can identify this Telefunken model? It uses strange Telefunken tubes, equivalent to US types: RENS324 = 24, RENS351 = 51 =35, and a Philips PH247 =47. Rectifier 80.

One of the tubes has a sticker by Telefunken, Milano, which qualifies it for special purpose (eg oscillator).

   

Any idea?

regards,KoBi 

Alessandro De Poi
Alessandro De Poi
 
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15.Jan.07 18:46

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According to Guida Pratica Antique Radio vol. 1, it looks like a Telefunken 540, made in 1932.
The picture in the book looks identical to your set, but hasn't got the Telefunken escutcheon below the dial. The book reports it has just 4 tubes, but it might be wrong.

Edit: the book must be wrong because also the schematic reports 5 tubes. Production years: 1932-33.

This article was edited 15.Jan.07 19:37 by Alessandro De Poi .

Konrad Birkner † 12.08.2014
Konrad Birkner † 12.08.2014
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D  Articles: 2334
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15.Jan.07 19:49

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Thanks, Alessandro,

this radio features an IF of 160 kc (might initially have been 150 or 170) . That is currently the resonance frequency of a filter, which may have aged. Could there have been a precedent model?

The tube count could have made the english way those days, when the rectifier did not count, but sometimes was mentioned separately, as for the tuning indicator.

The unusual Telefunken tube types are embossed at the sockets:
RENS324  RENS351  RENS324  RES347  RGN380 

 

This article was edited 15.Jan.07 19:52 by Konrad Birkner † 12.08.2014 .

  
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