08-17-2013, 10:00 PM
Thanks Ron. I spent some time working on it today. I got the electrolytics wired up according to schematic, but it only cured about 75% of the hum. There is still a hum, it is not tunable and it is not affected by the volume control. I only had about an hour to work on it today. It's no where near as bad as before, but it still needs to be fixed.
I'm going to follow the entire schematic tomorrow, starting from the electrolytic caps, since that seems to be where the previous changes were made. There is also a loud screeching sound at certain parts of the volume. If I jiggle the volume control around, I can sort of control it. Mostly it happens when it's turned up loud. I drenched the volume control with contact cleaner and it didn't help. The radio picks up very distant stations, and if you can ignore the hum, they come in clear. It'll be a real player if I can get it sorted out.
I'm going to follow the entire schematic tomorrow, starting from the electrolytic caps, since that seems to be where the previous changes were made. There is also a loud screeching sound at certain parts of the volume. If I jiggle the volume control around, I can sort of control it. Mostly it happens when it's turned up loud. I drenched the volume control with contact cleaner and it didn't help. The radio picks up very distant stations, and if you can ignore the hum, they come in clear. It'll be a real player if I can get it sorted out.
The artist formerly known as Puhpow! 8)
