Hello I need some help for my TR-4C which give me some trouble. Hopefully someone are able to give me some useful ideas.
The receiver seems to be fully OK on all bands. But something is wrong on the transmitter side. I have added a table which show what happend if I try to tune UP on the different bands. When I turn the XMTR GAIN CW, and Mode Switch in X-CW, according to Instruction Manual for tune up, following happend: Band Lower sideband Upper sideband 80 Draw no current OK 40 OK Draw no current 20 Draw no current OK 15 OK Draw no current 10 OK Draw no current All the voltages from the AC-4 are OK. Bias current on all bands is OK. Why will the transmitter not draw current in the red marked areas. Thanks in advance. 73 Bent OZ5ZD
