RCA 621ts Restoration

[Electronic M]

LOL. Here is a clue on that aqua dag check. If you use the grounded screw driver CRT technique to discharge the HV, then use the same tools set up the same and with the set on touch the blade of the screwdriver to the aquadag coating in a few spots and if you get an arc or spark then the CRT's dag ain't properly grounded. Might also be able to use a HV meeter instead of a screwdriver.

Awhile back I accidently confirmed I had this issue on my CTC4 with my hand.....it shook me up and made me swear like a pirate. 25KV can certainly alter ones vocabulary and mood.

[old_coot88]

Originally Posted by vts1134

The white bars roll right along as I adjust the vertical hold out of lock, and back in place when I adjust the vertical into lock.
I'm not sure how much ripple would be needed to cause a symptom like that but G2 has in the neighborhood of 3VAC present on it without any signal injection.

Well that rules out G2 and leaves only the cathode of the CRT. Try this for the heck of it- hook that 10mf electrolytic from ground to the cathode (observing polarity of course) and see if the bar remains.

One other thought- After doing the cathode shunt, try shunting G2 with the 10mf cap. Hook its neg. end to top of C116B (which carries smoothest B+) and the positive end to G2. This will effectively kill all ripple on G2, just in case the 3VAC is sufficient to cause the bar.

Maybe it was the butler in the library with a pipe wrench?

Maybe he was in the library with a wench.

[vts1134]

Originally Posted by old_coot88

Well that rules out G2 and leaves only the cathode of the CRT. Try this for the heck of it- hook that 10mf electrolytic from ground to the cathode (observing polarity of course) and see if the bar remains.

One other thought- After doing the cathode shunt, try shunting G2 with the 10mf cap. Hook its neg. end to top of C116B (which carries smoothest B+) and the positive end to G2. This will effectively kill all ripple on G2, just in case the 3VAC is sufficient to cause the bar.

Negative on both counts .
I also did the grounded screwdriver trick to spots on the dag with the set on to check grounding of the crt and it was ok.
Could it be the tube itself?