telefunken: unknown Telefunken

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 

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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.

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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 

 

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