Sencore SS105 - sweep troubleshooter question

[DavGoodlin]

Our weather went from 0 degrees 3 days ago to 60 this am with drizzle. My barely heated work spot was actually comfortable not all soaking wet from the condensation. So I decided on an extra 30 minutes to get somewhere with this.

I fired this little box up this morning after a re-cap I did a day ago and the neon lighted to indicate the oscillator is running. I did not try the HOT cathode current socket on the 'DQ6, or measure the HOT screen grid voltage on the socket with the voltmeter function. I need a functioning vertical oscillator
ss105 sweep subber.jpg

I touched the ball-hook connector to the grid of the 10DE7 output and saw some action. About 140 v-pp of vertical sawtooth brought sweep to 75% of the screen with a 3 inch fold-over.

Moving to the plate of the oscillator brought a similar sweep return, but the TV's oscillator grid did not. The vertical feedback, vertical hold control ties this point, so removing the grid connection may bring it back, pointing to a loop issue.