05-04-2021, 04:42 PM
Hi Gary,
I've completed my recap and the radio sounds great. Still have plenty to do. My BOL bulb works with 3 three volt battery source, but not when connected to the chassis leads (and the selector switch set to phono. I did trace it back to the OSC transformer. Did you ever check the resistance to ground at that point? I'm reading 0 (ZERO) while I thought I'd get least .5 ohms. The OSC trans looks OK on visual inspection, and the radio is working - I get stations when I plug in the speaker. I'm thinking it is really probably OK. But when powered, I get no voltage on C3. Do you know what should be there?
If I may ask, the trimmer is closest to the chassis, correct? That part has three adj. caps in it and that is what I believed I traced it to. (Gee, I guess this assumes that they were consistent at the factory in their wiring.) Did you ever check the resistance to ground at that point? I'm also reading 0 (ZERO) while I thought I'd get least 2 ohms ( 1 + 1.1 per the schematic.) (from 11B). It looks like it hasn't been adjusted since it was first sold. I had to clean out the dirt from the trim screw head. Could it really need adjusting at this time. I did not replace this cap givin the integrated part it is in. I was thinking of giving it a blast of DeoxitD5 and letting it dry.
I did this testing with the speaker unplugged and the turntable off. But it looked like as long as the selector switch is on phono, I should get the bulb on.
This is all new ground for me. Any guidance you can give will be appreciated.
Thanks & Regards,
Gary
I've completed my recap and the radio sounds great. Still have plenty to do. My BOL bulb works with 3 three volt battery source, but not when connected to the chassis leads (and the selector switch set to phono. I did trace it back to the OSC transformer. Did you ever check the resistance to ground at that point? I'm reading 0 (ZERO) while I thought I'd get least .5 ohms. The OSC trans looks OK on visual inspection, and the radio is working - I get stations when I plug in the speaker. I'm thinking it is really probably OK. But when powered, I get no voltage on C3. Do you know what should be there?
If I may ask, the trimmer is closest to the chassis, correct? That part has three adj. caps in it and that is what I believed I traced it to. (Gee, I guess this assumes that they were consistent at the factory in their wiring.) Did you ever check the resistance to ground at that point? I'm also reading 0 (ZERO) while I thought I'd get least 2 ohms ( 1 + 1.1 per the schematic.) (from 11B). It looks like it hasn't been adjusted since it was first sold. I had to clean out the dirt from the trim screw head. Could it really need adjusting at this time. I did not replace this cap givin the integrated part it is in. I was thinking of giving it a blast of DeoxitD5 and letting it dry.
I did this testing with the speaker unplugged and the turntable off. But it looked like as long as the selector switch is on phono, I should get the bulb on.
This is all new ground for me. Any guidance you can give will be appreciated.
Thanks & Regards,
Gary
