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telefunken: E52 (E 52) / T8K44 (T 8 K 44); 'Köln'

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » telefunken: E52 (E 52) / T8K44 (T 8 K 44); 'Köln'
           
Bo Samuelsson
Bo Samuelsson
 
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23.Dec.06 16:49

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I bought an E52a-1 Köln from a colleague around 1960.  As I was young and foolish I repainted it and "modernised" some of the modules with miniature valves like 6AK5 and 6X8. After that the receiver did not work well, probably due to bad alignment of the tuning condenser.

Now I am a lot older and hopefully wiser and I have restored the E52 to a state as close to the original as possible.  The receiver was far ahead of its time with very high sensitivity (2 RF and 3 IF stages), selectivity (2 crystal controlled variable bandwith stages +-200 to +- 5000 Hz) and stability (carefully temperature compensated circuits). The design was using interchangeable modules, a wiring backplane and the same valve throughout the receiver stages, RV12P2000. There was also a very accurate projected dial for the tuning.

I have attached pictures of my receiver before and after restoration. It is now working very well on three of the bands. In step two  I will restore the remaining 2 bands. More details and pictures in my web pages at http://goto.glocalnet.net/bosradio  .

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This article was edited 23.Dec.06 17:15 by Bo Samuelsson .

  
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