I fixed the set (again)
It took a while, but eventually I found this bad resistor hiding under a coil
That supplied +130V to the 2nd IF stage. That's right before the detector so no picture or sound. I replaced it and got the picture back but no sound.
More troubleshooting revealed the coupling cap between the volume control and audio output tube had a broken lead. I quickly soldered that back on sound was restored
Better yet, I have full vertical although the control is near the edge of it's range. I'd still like to find out why the 410 line is a little low
When I first popped this set open, I found a 1.8K resistor someone had added between the 410 line and 10uF filter cap.
That seemed odd and I removed it. It might be worthwhile to put it back. Doesn't seem like adding a resistor is going to increase the voltage though.
Also, replacing the weak 3CB6 increase the gain and I have a brighter picture.
Odd that it and the 5J6 test weak now when they were good a couple weeks ago.
Maybe running this set for a few hours drained what life they had left ?
The picture is off-center to the left a little, but I can take care of that by adjusting the ion trap magnet or centering magnets.
