Hello. I have recently acquired an old National NCX-3 tri-band transceiver and I am trying to get it air-worthy. Receive is good. Unfortunately, listening to it on another (reliable) receiver, I can hear it drift up and down-frequency on transmit on CW. I'm pretty sure that it would do the same on SSB. I am hoping someone out there can help me get up to speed on diagnosing and fixing this problem. I have generally had good luck utilizing my skills and Google in repairing other rigs. This rig doesn't seem to have a lot out there on the internet for me to go on. Any suggestions where to start?
Thanks in advance for any and all suggestions.