Hi Gary, Insufficient c/l meter deflection is usually caused by low gain in the agc amp circuits or bad caps on the agc line. Try replacing V508 and V509. The caps that usually cause this are C547, C548 and C551, but there are many other problems that can cause it. See Charles Steinmetz agc diagnosys document on our website and my agc diagnosys part 2, both in the 'repair tutorials' section.
Regards, Larry On Fri, Sep 15, 2023 at 9:24 AM <[email protected]> wrote: > Larry, > > > > Thanks. Manfred Antar advised me privately to adjust the pot for the > carrier level meter. While that brought the meter to zero, it barely > deflects 30% even on the strongest local BCB stations. As well, on MGC, > the needle now goes negative. > > > > I will replace V506A and check the value of the plate resistor. > > > > Thanks for your input. > > > > > > *From:* Larry H <[email protected]> > *Sent:* Friday, September 15, 2023 12:17 AM > *To:* [email protected] > *Cc:* [email protected] > *Subject:* Re: [R-390] Carrier Level Meter full deflection > > > > Hi Gary, One possibility is that V506A is very weak or dead or its plate > resistor R549 is open or a very high value. > > > > Regards, Larry. > > > > On Thu, Sep 14, 2023 at 5:59 PM <[email protected]> wrote: > > Good evening, > > > > I am hoping for some help on this. On EAC S/N 3122, upon turning on the > radio, even without an antenna attached and not tuned to any signal, the > carrier level meter deflects fully in both AGC and MGC mode. The AGC > appears to be working because, on strong signals, the sound at the output > is > not as strong as on MGC. > > > > Any thoughts as to what may be causing this issue? > > > > Thanks in advance. > > > > ______________________________________________________________ > 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
