Please click your language flag. Bitte Sprachflagge klicken.

RF transformer Repair

Ernst Erb Martin Renz Vincent de Franco Miguel Bravo-Cos Alessandro De Poi Heribert Jung Bernhard Nagel Eilert Menke 
Please click the blue info button to read more about this page.
Forum » In General » RF transformer Repair
Ross Hoff
Ross Hoff
USA  Articles: 16
Schem.: 0
Pict.: 0
04.Oct.09 17:08

Count of Thanks: 7
Reply  |  You aren't logged in. (Guest)   1

  While trying to bring life back to a 179 Crosley I found the primary winding of the RF transformer, [ plate to B+ ] winding to be open. Because of the difficulty of finding a replacement, or trying to rewind the open winding, I bypassed the open winding with a 25K resistor at 1 watt , then connected a 500pf capacitor to the plate of the RF Amplifier tube and to the grid of the Oscillator Modulator tube. Easy fix and the radio now plays very well.

Konrad Birkner † 12.08.2014
Konrad Birkner † 12.08.2014
D  Articles: 2334
Schem.: 700
Pict.: 3655
12.Oct.09 09:33

Count of Thanks: 7
Reply  |  You aren't logged in. (Guest)   2

Please post from the relevant model page, not in talk. 

Well, it works, but it is a makeshift solution. If possible a correct replacement should take place (look for a basket case contemporary Crosley chassis).

Good luck !

This article was edited 12.Oct.09 09:36 by Konrad Birkner † 12.08.2014 .

Joe Sousa
Joe Sousa
USA  Articles: 664
Schem.: 214
Pict.: 434
13.Oct.09 03:01

Count of Thanks: 6
Reply  |  You aren't logged in. (Guest)   3

Your posts prompted a post from me sharing my experience with untuned RF transformer repair.

Thanks for the resistor tip, just the same.