66 motorola contrast issue

[timmy]

oh so maybe the 23egp22 i have in there now is a much better one since it has a date of december 1980. but even a 10 year warranty would be up by now, lol lol

[Electronic M]

Originally Posted by timmy

oh so maybe the 23egp22 i have in there now is a much better one since it has a date of december 1980. but even a 10 year warranty would be up by now, lol lol

Odds are it's a rebuild, and probably a LOT better off in terms of reliability because of that rebuild...

IIRC the electron guns in the EGP were essentially the same as those in other tubes, but the early EGP cathodes did not last as long as they should...So a rebuild with better made cathodes should be every bit as good as a properly made non-EGP.

[dieseljeep]

Originally Posted by timmy

oh so maybe the 23egp22 i have in there now is a much better one since it has a date of december 1980. but even a 10 year warranty would be up by now, lol lol

Here, I thought that the 23EGP22, I bought was a real gem. Rebuilt by Video Display Corp in the mid-80's, with a 2 year warranty on it. It's even a rare-earth.
I thought to myself, This set's going to have a great picture. I checked the tube before installing it. Zip, nutin, nada, not even a heater glow. I even started it at a lower heater voltage. Looked like it went to air, but no white on the getters.
When sent, it was packed very well and shipped by Fed-Ex. Both boxes were in good condition, so it didn't appear to be mishandled.
I don't think the tube was checked before it was shipped.

[DaveWM]

I still have a VDC 23vecp22 in the box, have not checke it BUT I did recently install one that a got a couple years ago into a zenith.

has a purity issue that can not be worked out. you can see it with the hand held degausser as what looks like a pinch or some other defect in the shadow mask in one corner the other issue is some purity in the top middle that shows like a purple stain. Its more noticeable on some background colors that others.

I have another on from VDC in the box, maybe someday I will try it out. Too bad since both test great with emissions and cutoff.

My guess is one of them took a hit to the corner, maybe jacked the shadow mask up. I hope the other one in the box is ok.

[Electronic M]

Originally Posted by dieseljeep

Here, I thought that the 23EGP22, I bought was a real gem. Rebuilt by Video Display Corp in the mid-80's, with a 2 year warranty on it. It's even a rare-earth.
I thought to myself, This set's going to have a great picture. I checked the tube before installing it. Zip, nutin, nada, not even a heater glow. I even started it at a lower heater voltage. Looked like it went to air, but no white on the getters.
When sent, it was packed very well and shipped by Fed-Ex. Both boxes were in good condition, so it didn't appear to be mishandled.
I don't think the tube was checked before it was shipped.

If the getthers are still normal, then perhaps it is just a bad heater weld. I'd consider getting something like a charged 80uF 200V cap connecting it to the heater pins and tapping on the neck with a screw driver....You have nothing to loose in it's current state.

[dieseljeep]

Originally Posted by Electronic M

If the getthers are still normal, then perhaps it is just a bad heater weld. I'd consider getting something like a charged 80uF 200V cap connecting it to the heater pins and tapping on the neck with a screw driver....You have nothing to loose in it's current state.

When I first checked it with a reduced heater voltage, the neck got a little warm to the touch, but I couldn't see any glow.
I'll try the charged cap trick, as the Crt is probably scrap.
When I first received the tube, it had a lot of gray plastic tape wrapped around the front of the tube, but not covering the bond between the CRT front and the safety glass. It was appearant the the tube needed cataract surgery. I didn't care about that, as long as it showed a good picture.
A little history about this set. I bought it from Doug, drh**** on Ebay.
The set is a low hours set, that is extremely nice and appears to not ever being repaired. All original tubes, clean inside and out. That was the famous CRT that almost cost him his life. It imploded, when he was attempting cataract surgery.
I bought a conversion kit on ebay for a 25XP22 and half the parts were missing. I guess some things aren't meant to be.

[Electronic M]

Originally Posted by dieseljeep

When I first checked it with a reduced heater voltage, the neck got a little warm to the touch, but I couldn't see any glow.
I'll try the charged cap trick, as the Crt is probably scrap.
When I first received the tube, it had a lot of gray plastic tape wrapped around the front of the tube, but not covering the bond between the CRT front and the safety glass. It was appearant the the tube needed cataract surgery. I didn't care about that, as long as it showed a good picture.
A little history about this set. I bought it from Doug, drh**** on Ebay.
The set is a low hours set, that is extremely nice and appears to not ever being repaired. All original tubes, clean inside and out. That was the famous CRT that almost cost him his life. It imploded, when he was attempting cataract surgery.
I bought a conversion kit on ebay for a 25XP22 and half the parts were missing. I guess some things aren't meant to be.

I'd make sure the heater is open first. If not all the cap trick will do is possibly risk damaging the heaters....Though if it is down to air and the neck is getting warm because the heaters are warming the air inside, it won't make any difference if the heaters get damaged since that is the point where only a rebuild may help.