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I checked the mic which has a 4 pin connector and it was not wired for the correct pinout. Rewired the mic. While I had it apart I noticed it was an electret mic and didn't know if the PC122 takes a dynamic or electret mic. Tried the rewired electret and still no audio or modulation. After...

I lifted all pins on the final (TR538) and the driver (TR539) and found they both tested fine. TR538: BE and BC had 0.64V drop. EB, CB and CE were Over Limit. TR539: BE and BC had 0.66V drop. EB, CB and CE were Over Limit. I made a sniffer cable for my Cobra radio, turned off noise...

So I pulled the shorting bar and did voltage measurements at TP8 keyed and unkeyed in SSB and AM. With the reference as the negative power supply lead, we have 7 ish volts on TP8 during AM and 14.4 volts in SSB (keyed and unkeyed were the same). With the reference as the chassis, the voltage...

Update: The below thread suggests that a diode test of 2SA1012 may not reveal if it is indeed not performing correctly as AM regulator: https://www.vintage-radio.net/forum/showthread.php?t=170468 I have some TIP42C's coming in the mail that I can try.

Thank you for your reply @SuperLid , I should be able to find the PA transistor, but I am not familiar with what an Exciter does in a transmitter or where to look for it; I will do some research on that, and if you have any tips please let me know.

Hi, this is my first post, and I'm thankful that such a great community exists for the HAM and CB radio hobbies! I purchased a very good condition PC122XL recently, made in 1992 in the Philippines. The seller said it was working fine, and when I received it, I noted that it was very compact and...