A Narrow Horizontal Hold Control

[Tim Tress]

It's time to fire up the oscilloscope. See if you have good horizontal sync pulses at the input of the phase detector.

[old_coot88]

Just a shot in the dark - does the ground leg (#3) of the dual diode have solid continuity to ground?

[Crist Rigott]

OK guys, I found the trouble. It was my Network 30-6035-2. After substituting tubes, checking voltages, checking resistances, checking for proper component values, I thought it could only be 1 thing.....my Network. I removed and replaced the Network. Lucky for me it was located in an open area of the chassis. Bingo, the H' Hold is working great.

I then did an autopsy on the defective Network. All the resistors were the right value and in the right place on the board. The 82pf 1KV capacitor tested bad. This one is a SMD cap. I don't know why it's bad. Perhaps I ruined it soldering it in. Maybe it was bad out of the package, I just don't know. As far as I know, no other 30-6035-2 has been reported defective. I have 2 other chassis here that uses that Network and they all work well.

Problem solved and on to finishing up the TV.