08-14-2013, 11:22 AM
Ok, I've been working on it. This is going to be difficult for me to describe because I may not know the correct terminology in order to explain to you exactly what I've found.... but here goes..
This radio has had previous work done on it, so, assuming the mistake lies in the previous work, I started tracing things according to the schematic. I noticed that there is a connection between one of the 8mf electrolytics and part number 33-3222 (70 on the schematic), (also, this is correct according to the schematic)... well, a wire had been added that connected the ground end of the same 8mf cap to the same joint on 33-3222. To me, that represents a short! .. So, I removed that wire and voila! I have full volume and the tone control now works on all three settings.
The only problem now, is that there is a hum all the way across the dial. It isn't terribly bad, it almost sounds like interference.. but it isn't right. Any ideas?
This radio has had previous work done on it, so, assuming the mistake lies in the previous work, I started tracing things according to the schematic. I noticed that there is a connection between one of the 8mf electrolytics and part number 33-3222 (70 on the schematic), (also, this is correct according to the schematic)... well, a wire had been added that connected the ground end of the same 8mf cap to the same joint on 33-3222. To me, that represents a short! .. So, I removed that wire and voila! I have full volume and the tone control now works on all three settings.
The only problem now, is that there is a hum all the way across the dial. It isn't terribly bad, it almost sounds like interference.. but it isn't right. Any ideas?
The artist formerly known as Puhpow! 8)
