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emud: 60; Rekord-Senior

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » emud: 60; Rekord-Senior
           
John Phelps
 
 
USA  Articles: 6
Schem.: 0
Pict.: 0
25.Jan.09 03:34

Count of Thanks: 5
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Hi everyone!

I am restoring an EMUD Rekord Senior 60 (US Export), and I have replaced all the paper caps and filter caps.  The radio worked well on FM, but was very sketchy on AM/SW bands.  Then all of a sudden, it totally stopped working.

I replaced all the tubes, and still nothing.  I believe its a problem with one of the IF transformers or a resistor but I am not sure.  Pilot lamps light, and tubes glow so I know they're getting power.  Does anyone have any suggestions where to look, what to look for?

Thanks for all your help!

John

Torbjörn Forsman
 
 
S  Articles: 101
Schem.: 26
Pict.: 58
06.Feb.09 20:48

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If the radio is completely silent, not even the weakest mains hum from the speaker or scratching sounds from the volume control or band switch, then you should first check the B+ voltage, it is very likely that a short has occured somewhere (for instance, in the rectifier valve). Watch out for fuses that may have blown or get open circuit by aging, although there are no fuses according to the schematic. More than once, a radio manufacturer has found necessary to include fuses afterwards, due to authority requirements on electrical safety (in the USA, that is the UL standards).

If you have B+ voltage from the rectifier, then check that the filtered B+ for V5's screen grid and all previous stages is ok.

Switch the radio for phono or tape and check that you get hum from the speaker when putting a finger in the phono or tape jack, if so, then you know that the LF amplifier stages are working.

  
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