Phil Nelson
05-31-2009, 01:26 PM
After replacing electrolytics, my RCA CTC-11 has a terrific picture on rabbit ears. Two things remain before I learn how to do convergence, etc. This is my first color project, so bear with me :)
-- Dirty tuner. You need to rock the tuner a little on some channels to get color or best picture. Channel 3 is completely black/white. What's involved with cleaning the tuner? Tried peering through the little holes in its case and didn't learn anything. I'm tempted to spritz a little DeOxit inside and work the tuner through all the channels, but not if that would be a Bad Thing.
-- No sound. I shelved this project so long ago that I forgot whether it had sound when I got it, but I think it did. The three tubes on the audio board are good. A soldering iron touched to the 6AQ5 audio output grid produces a buzz. Voltages on those tubes look high. 271v on pin 6 of the 6AQ5 output tube, where the schematic says 150v. 224v on pins 5 and 6 of the 6EW6 sound IF tube, where 150v is expected.
While I'm at it, an even dumber question. To power up with the chassis on the workbench, can you just leave the CRT disconnected? I don't have the stuff to make extension cables, and the alignment directions suggest you can do this ("the HV lead should be securely taped and kept away from the chassis").
Thanks!
Phil Nelson
-- Dirty tuner. You need to rock the tuner a little on some channels to get color or best picture. Channel 3 is completely black/white. What's involved with cleaning the tuner? Tried peering through the little holes in its case and didn't learn anything. I'm tempted to spritz a little DeOxit inside and work the tuner through all the channels, but not if that would be a Bad Thing.
-- No sound. I shelved this project so long ago that I forgot whether it had sound when I got it, but I think it did. The three tubes on the audio board are good. A soldering iron touched to the 6AQ5 audio output grid produces a buzz. Voltages on those tubes look high. 271v on pin 6 of the 6AQ5 output tube, where the schematic says 150v. 224v on pins 5 and 6 of the 6EW6 sound IF tube, where 150v is expected.
While I'm at it, an even dumber question. To power up with the chassis on the workbench, can you just leave the CRT disconnected? I don't have the stuff to make extension cables, and the alignment directions suggest you can do this ("the HV lead should be securely taped and kept away from the chassis").
Thanks!
Phil Nelson