On the bench: Sylvania Halolight 21C611M

[Bill Cahill]

Looks short to me, which looks like bad seleniums to me..................

[Kamakiri]

A tweak of the height control brought the vertical full screen. After letting it play for about 5 minutes, the sides began to fill out a bit. Bear in mind that I had done no picture tweaking before I took this shot......it was basically letting it play for a minute after first power up on a variac.

[Kamakiri]

Here's where I'm at with the Halo....any thoughts as to how I can adjust the picture to fill out on the right?

http://www.youtube.com/watch?v=RPSNHOG0TIU

[Electronic M]

If you have played with the width linearity and centering already then add an HV rated pF cap across the damper tube, if not play with those controls first.

I'm not 100% sure on the wiring or value of that cap(There are threads on it though), but if you have a tube color TV with a jumper to increase or reduce width then the increase width cap circuit should be applicable to your set and may help.
Putting in REALLY strong testing HO and damper tubes can also help.

[DaveWM]

Low B+ does it match what the sams say it should be?

Did I see that you have the orig selenium rectifers still in? if so may be the cause of low B+ (if test low).

I assume the centering rings have been tried, I ask cause generally speaking you would have equal amounts of space on either side to confirm the pic is actually narrow.

[Kamakiri]

That's the one with the original seleniums, and now that I've got the advice from Findm-Keepm on that, I'm going to replace those.

The centering rings I played with a little, they were half-frozen and every time I move them I end up tilting the stupid yoke. Any suggestions for freeing those up? I didn't want to use anything that would end up throwing anything off.

[DaveWM]

the width will prob be ok after replacing the old rectifiers. check the B+, higher line voltage found in many locals AND silicon will likely cause excessive B+, take a reading add a 20 ohm in the B+ line, check again... adjust as needed to get where the sams say it should be. Measure the voltage drop across the resistor, measure the current thru the resistor, multiply, for wattage, then oversize by *2 for wattage rating of the resistor.

A little spritz of some of your fav pot cleaning juice should free up the rings.

you rotate then and spread them to effect movement for centering. Your not going to mess anything up, its pretty straight forward (not like purity setup on a color set). The yoke should be snug up against the bell.