admiral 24c15 with 20b1 chassis attempt at restore

[old_tv_nut]

The thing that interests me is how the upper left corner is pulled in. I think that has to be caused by the positioning of the neck components.

[fumplet]

Yes most likely neck parts..I was tweaking those as well. It didnt have this issue before.
Whats also interesting is the more I messed witht all the controls especially the back ones is they cleaned up and the set became more stable when adjusting and also basic operation

[bandersen]

Fantastic. Sometimes they need to run a while to work all the quirks out.

[Penthode]

I would suggest the upper left may
be affected by a stray magnetic field in the bell area of the CRT. It could be caused by a piece of magnetised metal strapping in that region.

The raster is deflected inward horizontally and vertically at the same time which should exonerate the deflection components.

You might try using a degaussing coil to see if it can remove the magnitism. A permanent magnet placed in the region should counteract the stray magnetic field.

[bandersen]

Cloth strapping. There shouldn't be any metal in that area.

[fumplet]

I think you may be right. A stray magnetic field. Because I have the focus coil. Quite a bit off from perfectly parallel horizontally and vertical to the neck of the tube just to get the picture centered.

[fumplet]

I have reception on the set now because I wanted to see if we had sound. Sound is very faint and distorted. When I bought the tv, it had a 6k6 installed in the 6v6 output tube spot for audio so possable source of crude faint audio even while fine tuning the audio knob.
As far as the neck goes I have the focus coil super tilted sideways horizontally to center picture.
Just plugged a kids game into the audio rca jack on the power supply.....sound gets through and loud using a radio shack 8 ohm speaker so yeah sound in main chassis time.
I have sound, I tweaked the 1st sound I.F. transformer. Sound got a lot louder, not as loud as it should be but better. I dont know if 8 ohms is the proper speaker. Havent tried the original speaker yet. I would like to get a degausing coil. Not sure I have any of the computer monitors anymore that I could rob one from.
Does anyone know the correct ohms for the speaker? Schematic shows nothing, neither does parts list other than "speaker" with part number.

[bandersen]

You don't need a degaussing coil. It's distorted because you have the focus coil tilted so much. Fix the horizontal linearity issue and your centering issue will be resolved.

[fumplet]

Ok so horizontal lin out of proper appearance is tubes, coil, or somerhing else out of adjustment. Ive seen cathode current of horizpntal output tube adjusted on youtube but not sure that applies here. I should post up a video of what the horizontal drive does when I adjust it. Those 2 coils over the power supply plug I have messed with.

[bandersen]

Yes and left side is mostly controlled by the damper circuit. Easiest thing to try is swap out the horizontal output and damper tubes if you have spares.
Adjusting the drive should affect the linearity, width and brightness. The service info outlines how to make all the horizontal adjustments.

[fumplet]

6bg6 I have swapped out just because thats the tube that kept on not having the filament light at times. 1b3 I have many of. Dont remember the other tube uness its the 6w4 theres one of those might be more would have to look at schematic agian

[bandersen]

Yes, damper is 6W4 and there is only one in the set. There is also a cap on either side of the linearity coil. 0.047 and 0.035 if I remember correctly. You could try tweaking those values.

[fumplet]

.035 is now .033 so I could add some value to that. I will have to look for a .047. I do remember .05......yes thats the same cap in the tiny admiral that was suggested to mess with because if I remember correctly the same linearity issues. I have swapped out the 6w4, 6sn7 6al5.
Sound I think works fine now since I have wired up the original speaker. Its ohm value is 3.5 ohms so thas why low sound.

[fumplet]

I thought about going larger with the .05 cap gonna try that...something has to move picture to the right

[Penthode]

I thought the linearity was okay? Changing the capacitors won't shift the image.
To center the picture these type sets, you have either centering rings on the yoke, potentiometer controls to vary a dc current though the yoke windings or move the focus coil around. I believe this set don't you just adjust the focus coil?