Awhile ago my R4A stopped receiving SSB/CW. With Garey's help, determined C173 was bad. Voltage measurements showed low voltage to Q6 etc, found R139 was 470 ohms per schematic that came with my R4A, someone had obviously replaced that resistor. Except, the schematic did NOT match my s/n 6759 R4A. The schematic on Garey's CD (which matched circuits in my R4A ), showed R139 should be 4700 ohms. After replacing the resistor and the cap, the R4A works better than it ever has.
Also, my T4X producing low output on 20M, adjusting the RF trimmers brought output up to proper levels. I'll wait to see if something is beginning to fail, causing the trimmers to need adjusting. Garey asked me to post these to the list. Without his help and his CDs, am sure both R4A and T4X would still be broken. 73, Curt KB5JO
_______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
