Ready to begin on my roundie

[mbates14]

i found the problem. The HV went excessive when there was no vertical, and I replaced a cap in the osc section, and cleaned out the yoke and reseated the connections, brought the vertical back to life. most of the set has been recapped already! I know the orange caps arnt stock.


I now have a full raster, and the tuner is dead. Why is it not the IF sections?
well because you know how you change channels right? duh. lol.

if you try your hardest, and if you hold the knob steady between two channels, (its like a sweet spot). you will get snow on the screen, and static sound. which means the IF is working, but if you put it on a channel, nothing. no sound or picture. but clean raster. even with cable or antenna hooked up.


im assuming the mixer/osc is working hence the static and the snow on the screen, but the RF amp tube is not working. but, I dunno. it may be just needing a good cleaning.

but, im getting a little farther in the restoration. The IF and sweep circuits along with the sound is working.

I cannot get the purity right no matter what I do, its a good clean spot from the center to the right of teh screen, they look normal.

the left is wacked out. red is blue, blue is green, and green is mixed. its hard to explain, like a magnet near the tube or something. The internal degausser is shot, so I used my soldering gun, and it still wont clear up. the centering rings hardly make a difference, and I have them placed between grid 3 and 4 according to the manual. I dunno.

[Steve K]

The orange caps may be original. Zenith used those for a long time. As far as purity, pull the yoke back toward the base of the CRT then adjust the purity rings so that the red spot is in the center of the screen. Push the yoke towards the front of the set until the red fills the screen. Of course you should degauss it first the best you can.
Steve

[mbates14]

yea i know, thats what I did. the spot got a little bigger when I pushed it back to the bell, but it didnt cover the whole area.

the service manual says to pull it back but-up against the convergence yoke WITHOUT turning the yoke, just pull it back. I did that. I set the rings where the spot was near teh center, I push the yoke back up to the bell, and the spot got bigger, and its red all the way from the center to the right of the screen. but its still blue on the left.

oh well. I dont have a degusser. the big black thermister on mine just smokes.

[nasadowsk]

Sounds like your tuner is dirty. If it's the turret type, I take out that whole assembly and clean EVERYTHING in there well. i don't recommend it, but you theoretically can soak the tunner in something like simple green. Gotta wash with clean water and make sure it's really dry prior to power, or *poof*

TV tunner 'cleaner' is evil stuf. it gums up, attracts dirt, so they sprayed more and more in there, and it never does anything real anyway.
BTW, the diff between regular and 'color' was that 'color' was scented!

I find once you get all the crap out, buff up the springs with an eraser or such, and form them out a it to make better contact, the turret type tunners work nicely. Switch types, you just clean and pray

[mbates14]

I fixed the tuner, i cleaned the whole thing out. all the connections were all gumed up and nasty.

after this. I got one thing to day

ITS ALIVE!!!!! I HAVE GREAT SOUND AND NOT SO GREAT PICTURE!!!!

i have it on cspan. I absolutly CANNOT get teh convergence to work whatsoever.

the dynamic controls take very little effect. Also, I had to use the slugs on the convergence yoke to get it to line up perfect in the center, but I can't get the blue to line up

and I absolutly cannot get the purity right. I think the CRT is magnetized and my degausser is not working. my soldering gun kinda works, but not really.

Also, does anyone have any 6KT8s they can send me? this set has 2, and one of them with open filiment.

i had no pic or sound. just raster. So, i took the 6KT8 out of the color osc circuit, and put it in the AGC/sync/sound circuit. and now, I have a watchable picture and good sound, but no color, because I dont have the 6kt8 for the 3.58mhz osc stage.

I will post pictures ASAP. i need batteries