Wow it is apparently unregulated unless there is more on another page.
Only other color sets I remember like that were GE's of the same era.
Sources #1 & #2 are the main B+. #3 & #4 are probably for the Hoz drive.
In any case it wouldnt hurt to check all the sources & be sure the are
running apx + or- 2%. The horz osc IC may also have some HV regulation
built in. Example it may sample the hoz out & adjust the drive to
raise or lower it. If the HV cant be brought down the set would go into shut down ( HVSD ) & kill the set.
Beyond that it may be a case of "build it cheap, it will "work" "
Hey JohnCT you got the Sams ? Its in 1825.

73 Zeno:smoke:
LFOD !

Yeppppp.. it's an unregulated power supply... a lot of companies did that, including Zenith. They just regulate the HV figuring that AC supplies by this time were more or less stable (?)

If I don't, I know someone who has. One of my friends was a SAMS subscriber, and unless that folder is missing (happens), I know he has the set. I'll check Monday when I get to work. If I don't have it, I'll stop by his shop Monday night and grab a pic.

John

Assuming that the set is working normally and B+ etc are correct, a simple way to reduce width is to put some inductance in series with the scan coils. I've done this on a few simple monochrome monitors which had no width control. A few turns of ordinary hookup wire on a bit of ferrite rod does the trick.

Far better than putting resistance in series with the scan coils, which are largely inductive at scan frequency.