I've mentioned this before, rather recently, but check CR19 in the cathode circuit of the driver, V4 (12BY7). I have 2 T-4XC transmitters that exhibited sudden drop (to nothing in both cases) in power output. Both had CR19 with cracks in the cases. The diodes would appear OK with a DMM (diode mode) but with the application of heat would open up. Maybe there's some intermediate mode that would allow moderate output power but that doesn't seem to make too much sense. Most semiconductors work or they don't work, in my experience!
A 1N4003 and up is good substitute for the B5G5 diode used by Drake. Bob K9JU
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