02-09-2010, 09:37 PM
Hello All,
This is my first phorum posting. My thanks goes to Ron Ramirez for his prompt and friendly help in getting me registered.
This is my first radio restoration project and it has been a challenge to say the least. After doing a lot of reading, I did what the books say and replaced all of its electrolytics with polyester caps. I also gutted the multistage can and clustered the appropriate axial lead capacitors inside. Finally, I replaced all of the tubes. When I powered it up with a variac it actually worked to an extent. Not very loud but it worked. After sitting on the bench for a number of months though, I could no longer get the thing to pull in any sort of station; just a hum that goes across the whole band. Now all I'm getting is an oscillation-type howl across the band.
In trying to check this out, I've encountered another puzzle which has to do with its 3-gang variable capacitor. In following the schematic, the lead from C13 goes to the C10 and C9 combination. On C7, which is the other variable capacitor, its lead goes to pin 6 of the 1R5 converter. Here's the problem: Between the bottom of the variable capacitor, and the chassis is a component connected between C7 and C13. It's a tight spot and kind of hard to see but I can make out what looks like a very short resistor with a green and brown band. However, the schematic shows this to be C11, a 350mmf capacitor. Which is it? Has anyone encountered this situation before?
Thank you for whatever advice anyone can provide.
"Dashpot"
Thanks for whatever advice anyone can provide. I'd really like to get this set going again
This is my first phorum posting. My thanks goes to Ron Ramirez for his prompt and friendly help in getting me registered.
This is my first radio restoration project and it has been a challenge to say the least. After doing a lot of reading, I did what the books say and replaced all of its electrolytics with polyester caps. I also gutted the multistage can and clustered the appropriate axial lead capacitors inside. Finally, I replaced all of the tubes. When I powered it up with a variac it actually worked to an extent. Not very loud but it worked. After sitting on the bench for a number of months though, I could no longer get the thing to pull in any sort of station; just a hum that goes across the whole band. Now all I'm getting is an oscillation-type howl across the band.
In trying to check this out, I've encountered another puzzle which has to do with its 3-gang variable capacitor. In following the schematic, the lead from C13 goes to the C10 and C9 combination. On C7, which is the other variable capacitor, its lead goes to pin 6 of the 1R5 converter. Here's the problem: Between the bottom of the variable capacitor, and the chassis is a component connected between C7 and C13. It's a tight spot and kind of hard to see but I can make out what looks like a very short resistor with a green and brown band. However, the schematic shows this to be C11, a 350mmf capacitor. Which is it? Has anyone encountered this situation before?
Thank you for whatever advice anyone can provide.
"Dashpot"
Thanks for whatever advice anyone can provide. I'd really like to get this set going again
