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William,
I'd check C-65, pin 8 on AC Jumper/Battery Soc. (X-1), R-36 and R-37, everything at S-1A, and in general, all components associated with the AVC Amp (V-16), the Phase Inverter (V-12) and the Audio Output section (V-13,14) and anything else which might in any way connect to these sections. Perhaps this is elementary and you have already run down these trails. R-36 and 37 would be my first looking place. Any of these could easily pull your line down (actually, I guess that would be up). Good luck, Roger Brown, KL7Q William Mutch wrote in message ell.edu... I've been renovating a Malden Mass Monster...NC183D. It sortta works, but the B- is supposed to be -21 volts and 500 ohms from chassis ground acting as the bias for the audio power amps and the negative end of the RF gain pot. On my rig the line measures only millivolts negative and 0.4 ohms to ground. I thought first I had a shorted electrolytic and replaced all the caps on the line. No joy. Then I thought the transformer center tap might be shorted to the case, so I unsoldered it and measured it. The Xformer is very healthy but the line still measures 0.4 ohms to ground. Any suggestions what I should look at next? tnx de kc2lvq |
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