CTC-5 Lost Vertical Deflection

[bgadow]

Originally Posted by miniman82

I’m only across the peninsula from you, if you wanna play with my roundie test jig.

Someday I have to come up with an excuse to see your collection! I played with the set for about an hour this morning without trouble. I seem to recall this same issue with an early bw set, maybe my 721TS, where the vertical osc seemed to need a "kick-start".

The convergence so far hasn't been as far out as I thought; mostly it was the static convergence being off. I can't quite figure out what caused it to change like it did. Could it be tied to the DC circuit they used on the -5?

[old_tv_nut]

Originally Posted by bgadow

... The convergence so far hasn't been as far out as I thought; mostly it was the static convergence being off. I can't quite figure out what caused it to change like it did. Could it be tied to the DC circuit they used on the -5?

I think if you happen to get a tube and yoke that requires little DC convergence current (the pot wipers are sitting at the tap point) then you will have minimum sensitivity to line/B+ voltage. But if your set needs more DC current for static convergence, then it will be more sensitive to line fluctuations. Don't ask me to experiment to prove my assertion, as I don't want the pain of having to readjust it after screwing it up.

I wonder, has anyone tried subbing a permanent magnet cloverleaf in a -5?

[miniman82]

Don’t think so, but it would be nice is someone figured out how to add the later style diode pack at least so there wasn’t so much interaction between adjustment pots.