621TS coming to life after 40+ years

[Eric H]

Well, I spent the afternoon stuffing another 6-8 caps and checking out some of the problems this set has/had.

Got the sound working, it has a bad connction somewhere under the 6AT6, possibly a bad tube socket since there is a lump of solder on the #7 pin like someone had been trying to fix this before.
The sound is working now after I tweaked the wiring around a little, though I'll have to do a permanent repair when I change out the caps on that tube.

The focus problem seems to be bad resistors in the focus divider circuit, they have drifted up beyound the 20 meg capacity of my meter.
(brown/red/blue is 12 meg ain't it?) If I jumper across one of the resistors to compensate I can get a nice sharp focus on the original 7DP4.

The sync is pretty stable now after changing out some more caps in the oscillator circuits, the video and sound are so good I may leave the i.f. caps alone, or at least change them one at a time to make sure I'm not screwing up anything.

Looks like i'll need a vertical output transformer, this one works but will drive me nuts with all the noise it's making!

Anyone know if the 630 uses the same transformer?

I posted a video of the working chassis here: http://www.vintagetvsets.com/videos/621.wmv
the buzzing noise you hear is the Vert transformer!

[Eric H]

The Electromag Ion trap still doesn't work, it might just be open but I don't know where the wires connect to to test it.
Looks like they might go to those big resistors inside the black box on the back?

Would anyone have a schematic for this set they could scan?
Sams #78 which I think it's just a single sheet schematic not a complete Photofact.