For the astute, you might have noticed at 8:03, I was on the wrong test point when checking for my AM transmit offset. I realized that later on when I doing the PLL alignment. It happens...
Repaired items:
D50 shorted and replaced
X2 was giving me some issues during the PLL alignment. After pulling it out of circuit and looking at it on an oscilloscope, I could then see it’s very weak output and overall nasty-looking waveform. So, I just went ahead and replaced it.
TR20 was faulty. Most likely from the hardened glue on its leads. I replaced it with a new 2SC1675.
Cleaned up all the hardened glue around TR26 in the modulation chain. Also installed a 330pf cap that was mysteriously missing from between the base and collector of the transistor. Only the capacitor leads were still present. Where did it go? 😂
A couple of electrolytic caps were changed out by me as well. Not due to being shorted but due to being way out of tolerance.
9 ноя 2023
