How to narrow picture

[zeno]

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
LFOD !

[JohnCT]

Originally Posted by zeno

Wow it is apparently unregulated unless there is more on another page.

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 (?)

Originally Posted by zeno

Hey JohnCT you got the Sams ? Its in 1825.

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

[ppppenguin]

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.