George, Do you still see the normal idle plate current (bias) of about 70mA when you key the transmitter with the GAIN all the way down?
KB8BKU, Darryl in Dayton On Feb 5, 2011, at 1:44 PM, K4GM- George wrote: > I turned on my trusty T-4XC a little while ago and it failed me! I will try > to swap out a tube or two but here are my observations in case anyone might > be able to point me to the fix. > 1. The PTO appears to work fine because I can use it to operate the R-4C > in transceive mode using the xmtr PTO. There is no transmit power > 2. The sidetone works well and the radio keys. > 3. The RF Tune will peak as it should. > 4. There is no dip when tuning the plate. In fact there is a peak oddly > enough. > 5. Adjusting the Load control has no effect on plate current. Relative > output is unchanged when adjusting the plate control. > 6. These measurements were made loaded into a 50 ohm dummy load. > > Hope I am lucky and it is only a tube. However I am seldom lucky; thus, I > sent this email. Thanks to all who respond. > George K4GM > > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
