Working on an Admiral 20X12

[Kevin Kuehn]

Originally Posted by Kamakiri

Then check from pin 3 (cathode) of the damper to the plate of the H.out tube. Should be around 165 ohms. Zero.

Zero is very bad. Sounds like your flyback may have a shorted primary, although it seems unlikely that it would form a dead short? Possibly there's a wiring error? Try measuring directly across pins 1 and 2 of the fly transformer, there should be like 185 ohms.

Also you need to find out why there's no B+ getting to pin 5 of the horz osc tube. You should measure something like 75,070 ohms from the fuse to the 6SN7plate(pin 5).

Here's the horizontal section from my Admiral schematic. Easier to follow than the Sams, plus it has the voltages and resistances marked on it.

http://i452.photobucket.com/albums/q...pstvpvazop.jpg