Admiral 14R12 Restoration

[Crist Rigott]

Yeah, I clean up all the terminals where I can. Once "cleared out", I clean them with alcohol, then it is as if I were assembling the TV for the first time.

I'm all done replacing the caps and all the resistors except one in the tuner. It was buried and I didn't want to dig that deep into the tuner. The rest of the tuner's resistors, mica caps, and the sole dual disc cap were replaced.

I did a quickee test with the 14" CRT. Everything works. Excuse the quality of the picture that's because the CRT was just set in the tv and hooked up. The yoke and the focus coil weren't adjusted yet, that will come later when the final assembly takes place.

Now on to finishing cleaning up the chassis and bits to ready them for final assembly.

[Crist Rigott]

I remembered that I needed to change out the resisitors in the deflection yoke.

There are 3 of them. 1 is a 1K and the other 2 are 560 ohms. The 1K measured out to 1030 Ohms, while the other 2 measured out to 670 Ohms and 736 Ohms. They were replaced with 1W 5% resistors.

I wish I could have found a 47pf 1500 volt cap to replace the one in the yoke.

[Crist Rigott]

I finished the chassis and assembled it today. there are a few details that have to be worked out, but basically its done. It's playing as I type to "burn it in". Tomorrow I'll hook up my Eico 369 and BK O'scope to start the alignment. Tonight I'll attach my NTSC pattern generator and see if I can get the picture squared up.

Then on to the cabinet.

[Crist Rigott]

I have the pattern generator hooked up and this is where I am. It looks like both left and right side of the picture is blurry. What causes this?

I did have both the yoke and focus coil off the chassis and then reassembled the whole shooting match. Can a misalignment of either of these cause this?

[Kevin Kuehn]

You mentioned it was out of focus earlier in the thread. It could simply be the combination of a tired electron gun and it being over driven to achieve what seems like normal brightness and contrast. The further the beam deviates from center the harder it is to maintain focus. You may be able to tweak the ion trap and get the outer edges a little better, at the expense of less focus in the center.


I kind of miss the plated chassis. I thought it looked really nice after you cleaned it up, not that it looks bad now, I guess I just prefer the plated look.

[Kevin Kuehn]

You also might want to double check that the dag contact spring is making good ground contact through the painted chassis.

[Crist Rigott]

Originally Posted by Kevin Kuehn

You also might want to double check that the dag contact spring is making good ground contact through the painted chassis.

Good idea! I'll clean that area up to make sure I have good contact.

[Crist Rigott]

Originally Posted by Kevin Kuehn

You mentioned it was out of focus earlier in the thread. It could simply be the combination of a tired electron gun and it being over driven to achieve what seems like normal brightness and contrast. The further the beam deviates from center the harder it is to maintain focus. You may be able to tweak the ion trap and get the outer edges a little better, at the expense of less focus in the center.


I kind of miss the plated chassis. I thought it looked really nice after you cleaned it up, not that it looks bad now, I guess I just prefer the plated look.

Kevin,
I'll play with the ION trap a bit to see if it improves.

The plated chassis had a lot corrosion, not rust, but corrosion. I tried to rub it off but then that area was "polished" and still had the discoloration from the corrosion on it. I think at one time somebody spilled something down into it or most likely sprayed something into it.

[Electronic M]

Originally Posted by Crist Rigott

The plated chassis had a lot corrosion, not rust, but corrosion. I tried to rub it off but then that area was "polished" and still had the discoloration from the corrosion on it. I think at one time somebody spilled something down into it or most likely sprayed something into it.

If that 'corrosion' was green/white-ish green(sometimes yellowy) and fairly even then it is not corrosion, but rather Cadmium plating. It is natural for cad plating to turn green-ish with age, and it does not hurt anything when in that state. Best not to polish cadmium...It is rather toxic. I always leave the metal on cad plated chassis alone.