Yes, it's C70 in the Sams Photofact - 0.5 mfd @ 200 volts.

It's also the only 0.5 mfd cap in the set. I really don't think that loose cap is 0.5 @ 600 volts. That would be a huge paper cap. Perhaps it's 0.05 ?
The one to the right of it (C69) should be 0.035 mfd @ 600 volts. I use 0.033 mfd @ 630v.
[quote][/quote]

Thanks Banderson,
You are right about the smaller cap being a .05, guess I was too tired when I looked at them last night.
The one to the right was replaced with a .033/630v cap and the other .033 cap is under the .47 cap
(I was unable to respond earlier, internet connection was down )
Bill

Finished Recapping and it passed the smoke test.
Looks like it needs some adjustment.
Brightness is good.
Bill

I adjusted the focus on yoke, hooked up a vcr and was able to get the picture working.
As you can see, it still needs some adjusting. I am unsure where the height should be adjusted
on this set. The mask covers about 1" at the top and bottom of the crt.
Should the pic cover the full screen?
I am also getting some bending at the top and the lines in picture are wider at the bottom.
Can these be adjusted or do I have more bad components?
I replaced all Lytics, wax caps and checked and replaced out of spec resistors that were on connected to caps I replaced.
Bill

You normally adjust the height so that the picture goes just slightly beyond the mask so that it does not fall below the mask if the power line voltage dips a little. Likewise for the width. Remember that the picture as transmitted is rectangular. Depending on the shape of the mask, you may be loosing the corners of the picture. For the lines being wider at the bottom, juggle the height and linearity controls. You may have to do a three way juggle with those controls and the centering. If you have a focus magnet, the centering is done by tilting the magnet. If you don't have a focus magnet, there are usually some rings on the back of the yoke for centering.

For the bending at the top, that is a common problem with older TVs when used with VCRs. The horizontal sync from the VCR takes a little jump when the heads switch unless the tape is newly recorded on the VCR you are using for the playback. Older TVs were designed with a horizontal sync loop filter with a slow response, so they do not quickly correct for the jump in the sync. Depending on you knowledge of electronic circuits, you may be able to make the loop filter cap smaller and fix this or make it less noticeable.

Thanks Tom,
This set has a focus lever that moves the yoke around on the neck of the tube.
I'll work with these adjustments and get it more centered and sized..
The mask opening measures 11" wide and 8.5" high.

I wasn't aware of the bending issue with the VCR. I plan to hook up a DVD player to it eventually
Will this bending be an issue with a dvd player also?
This is the first tv I've recapped so probably won't try modify the loop filter cap for now.
Bill

The bending should go away when using a DVD player.

I am trying to get the pic adjusted, can't get the right hand side adjusted far enough.
The first pic is closer, (using focus coil adjustment) but it's creating shadows on the corners so
moved it back a bit. . The height and vert lin seem to be ok. ( the blank area at top and bottom are
just under !", though not visible in pic. The dark bands on the screen are only visible on the pics.
I am using a pic of a test pattern recorded to a dvd)
Would an adjustment of the ion trap affect the shape of the circles or the blank area on the right? Adjusting the width didn't seem to make much difference
Bill

Your width is short. That needs to go all the way to the sides. As you are adjusting focus coil, you may also need to touch up ion trap to maximise brightness, and,, get rid of shadows.
It's a game of find the hidden electron beams.
Bill Cahill
Nice picture, by the way......

Your horizontal linearity is off, causing the circles on the right side to be narrower horizontally.

The linearity adjustment is interactive with the width, meaning that adjusting one affects the other, somewhat. If you tinker with them alternately, you may be able to fill the screen horizontally, although linearity is hard to get perfect on some TVs. If the width fills the screen, you may find that some slight non-linearity isn't very noticeable when watching normal programming.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

Thanks Phil,
I will adjust them some more and see if I can get it closer. Before I got the test pattern,
I had adjusted the horizontal lin. and width coil about 3 1/2 turns c.w., didn't seem to affect the right side much.. The width adjustment is back where it was originally and the horizontal lin is still at 3 1/2 turns.
Bill

Also check the horizontal centering, however that is done on your set. (Some TVs have an electronic centering control, on others it is mechanical.) If the centering is far off, fighting with the linearity & width may be kind of a losing battle.

Have you checked resistor values in the horizontal circuits?

Phil Nelson

The focus adjustment on the neck of the pic tube does move the picture around, not enough to cover the right side of the screen without causing shadows as it is too far.
I did check resistors and replace out of spec ones when I recapped. It's possible I missed one.
I am also going to replace any of the old mica caps I may have left in there.
ajusting width and horizontal lin. has no effect. There is no horizontal centering control I can find, mechanical or electrical. There is a couple trimmer caps in the horizontal circuit underneath that I haven't adjusted.
Bill

Yes, the width and linearity have only a subtle effect on the picture. Those trimmer caps will have a significant effect on the sync (hor. locking range) and linearity (hor drive). You should go through the procedure outlined in the service info for making all those adjustments.

The centering is mechanical. The focus coil is mounted on a sort of gimbal. The should be lever you can adjust it with.

It's on page 12 of the Sams here: http://www.earlytelevision.org/images/A ... -100-1.pdf

I have adjusted the focus coil as far as I can to move the picture to the right, if I move it farther, the scren gets dark areas on that side because it is too far . I have the chassis on it's side and am in the process of rechecking resistor values and replacing the mica caps that I had left in before.
I will let you know what i find.
Bill

I checked the 470pf cap between terminal D of the horizontal lock and the Horizontal Drive, it's bad. I checked the schematic for the value of the resistor hooked between pin 4 of the 6sn7 and terminal F on the Horizontal Frequency coil. 2 different schematic show there should be a 180 pf cap here. The wire-wound resistor reads 9 meg (open?). Was it common to sub a resistor in place of a cap in this circuit?
When I get the parts, I'll change them out and see if that solves the problem.
Thanks,
Bill

Not that I know of. I've found some weird parts substituted in these Admiral sets too. I've always restored them to exactly whats shown in the schematic and they work fine

I replaced the rest of the mica caps in the horizontal and vertical circuits. I adjusted the Width and Horizontal Linearity in almost all the way and pic filled the screen. After I set the chassis upright, I still had the gap on the right side of the screen. I then replaced the 6BG^ with another one I had which eliminated this gap. I was unable to get the test pattern circles even, after spending a long time adjusting the controls. I put another 6BG6. in and after some adjustments it looks good.
I still have to work on the volume as it's not real loud. I'm also getting a lot of buzz through the speaker whenever the picture on the DVD changes. The Sams book says this can be caused by
too strong a signal . Is there an easy way to reduce the signal strength from the DVD player?
Thanks,
Bill

I replaced the audio tubes, (one checked good but don't work) along with a resistor and mica cap in the Ratio Det circuit
Volume level is good and got rid of most of the audio buzz. I still have some when watching preview screens on a dvd. It's gone when watching a movie but still get some
when white lettering is shown on the screen.
I followed the directions in Sams for eliminating the audio buzz. They have a whole section devoted to this problem so may be as good as it for this type of set.
Is this what can be expected for this set? If so I'm going to put it back together.
Thanks for all the help.
Bill

On many old TVs, some degree of buzz is inevitable on those scenes with extreme contrast (white letters on pure black background, etc.).

If it sounds fine during normal programming, you're probably done.

Phil Nelson