Old CRT booster just lost it's job today!

[TUD1]

The Beltron is a very simple device, and mine is in very poor shape, but it's my favorite. It wins over my 467 and CR70.

[mr_fixer]

Originally Posted by TUD1

The Beltron is a very simple device, and mine is in very poor shape, but it's my favorite. It wins over my 467 and CR70.

I agree, but i am thinking that crts were over-built back in the day and had more cathode coating than newer ones. That is why i like 2 crt tester/rejuvenators in my stable. I like to use the weaker one first "sencore cr70" for lesser crt's" and Beltrons when the weaker ones don't quite cut it. As i said before the Beltrons i own have seen more usage, which means they had better results back in the day. Remember that there are no new crt's available and we must do the best we can with what we have.

[Electronic M]

Originally Posted by mr_fixer

I agree, but i am thinking that crts were over-built back in the day and had more cathode coating than newer ones. That is why i like 2 crt tester/rejuvenators in my stable. I like to use the weaker one first "sencore cr70" for lesser crt's" and Beltrons when the weaker ones don't quite cut it. As i said before the Beltrons i own have seen more usage, which means they had better results back in the day. Remember that there are no new crt's available and we must do the best we can with what we have.

+1.
I have yet to put my money where my mouth is on this (I'm the Jack Benny of the test equipment market), but I agree best to start with the most gentle rejuve available and work your way up till you get results... I've seen the CR70 slowly and gently work miracles on tubes that did not move the needle on emissions, and I've seen and operated harsher testers that have ruined cathodes.

Best to shoot Godzilla with howitzers and conventional explosives before nuking the city.

[zeno]

Originally Posted by Electronic M

Best to shoot Godzilla with howitzers and conventional explosives before nuking the city.

A good way to put it. We always used clean & balance first & most times
went no further. After rejuve we would run it over night then let it sit off
a day before final adjs. Some jobs would last over a yr others just a month.

The main purpose of brighteners & rejuves for us was to get sets out
& paid for. If you just told them the CRT was bad they abandoned the
set & never paid an estimate. If you get it running much better "for now"
the set got picked up & we got paid. We also gave them a coupon tward
any new Zenith for part of the charges to be presented AFTER the best
deal was made. That made for tons of sales.

73 Zeno
LFOD !

[DavGoodlin]

Originally Posted by mr_fixer

That is why i like 2 crt tester/rejuvenators in my stable. I like to use the weaker one first "sencore cr70" for lesser crt's" and Beltrons when the weaker ones don't quite cut it.

The test equipment stable is a perfect analogy. You do not trust a workhorse like the B&K 440-445 to gently restore any CRT, though you have the adapter or gun-switch/socket adapter to do so. With only one meter, the 445 is a tad cumbersome to compare cutoff and emission while switching between guns. I do like the way it TESTS roundies and deltas because the scale is bigger and easier to log readings from.

I trust the 445 to test my delta gun color tubes but only the HK gets a whack at first cleaning (using 110Vac) only THEN rejuv-ing (using 300vDC) if cleaning fails to get some action.

While a "made-for-color" CR70 or 465 may work best restoring CRTs, testing them is best left to a period-correct device for what your testing.