I bought a radio that seems to do everything right but has NO modulation. Recieves good, power out good 5w, but No modulation. No hum buzz when I touch the audio pin on mic socket. Tubes check good, bypassed the mic gain control but no hum when touching connections. This is a DAK CB with transistor receive and tube transmit. ANY Thoughts? There are 3 - 47microfarad caps that I'm questioning but can't test and don't have any to try. see schematic pic. Email me for schematic ron222@embarqmail.com Thanks Ron