Quote:
Originally Posted by fsjonsey
BINGO!
Today I replaced all the ElMenco, Bumblebee, and other suspect paper caps under the chassis. I also replaced the 100uf electrolytic that feeds pin 4 of the vertical output tube that Bill R mentioned. Bill had it right. A new 100uf cap solved all the vertical issues. I now have full vertical height and good linearity. I still don't have color, despite also replacing all the tubes in the color section with NOS replacements. Where should I look next? The bad 100uf Electrolytic was a cardboard cased Sprague "Atom". Is it just my experience or are Sprague "Atoms" always bad?
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Commonly yes. With how old most of them are. The capacitor you replaced was the 100uF 50V in the front of the chassis, C6 on the sams schematic.. It was bad in both of my sets, in one the vertical would collapse under bright images, and the other it would flex and bow.
Replacing it is a must on these.
Mine still has the vertical issue, stretched at the top and compressed at the bottom. I'm working on doing away with C4 entirely, but the caps I ordered got lost in the mail, so I'm suffering a bit of pointless run around.
The color issues might be in your tuner section. There is a very simple way to feed these sets A/V input to see if that produces color at all. I could post a picture from the schematic if interested, or how it was done on my chassis.