Oops AGC. It said that at first, and then auto corrupt changed it to HVAC. Good times.
Dave Wise > On Mar 12, 2024, at 9:56 AM, Cecil acuff <[email protected]> wrote: > > It’s been my standard practice to replace all paper caps in the “A” model > radio. You may be able to find the single culprit but next week, or month > there will be another. I would just bite the. Bullet and replace them all! > > Cecil > > Sent from my iPhone > >> On Mar 11, 2024, at 5:44 PM, [email protected] wrote: >> >> I followed Charles Steinmetz's troubleshooting procedure for AGC issues and >> the following resulted after tuning to a very strong BCB station: >> >> >> >> Voltage Terminal 3 & 4: -0.37V - not good >> >> >> >> Then step 2: >> >> >> >> Resistance Terminal 3: 460k - maybe passable >> >> Resistance Terminal 4: 24.6k - horribly off spec >> >> >> >> So, my problem is most likely in "any of the several dozen bypass caps on >> the AGC line in the IF and RF sections, or leakage to ground in one or more >> of the mechanical filters". >> >> >> >> Now my ignorance shows up. How do I identify what are bypass capacitors? I >> assume that these are capacitors that go to ground? >> >> >> >> I also note that, on the very strong BCB station, I get no sound output >> until the RF gain is up to 8, if that helps narrow down where I should start >> searching. >> >> >> >> Thanks in advance for any help. >> >> >> >> Regards, >> >> >> >> ______________________________________________________________ >> R-390 mailing list >> Home: http://mailman.qth.net/mailman/listinfo/r-390 >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
