Posts: 2,572
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
hey guys
have a philco 50-t1403
before I get into recapping it. thought I would check crt
have a bk 440crt tester. don`t know if it works right as needle never moves.
but the one tube it has lights up and g2 light flashes once if I change selection.
so I took chance powered up tv all tubes light up trans cool but
no light in yoke. had a booster on it too
crt has sticker saying replaced in 1964
so I take it crt is bad
any have one ?
also screen has guess cellophane cover in it ?
[Image: http://i1303.photobucket.com/albums/ag14...ox2qw7.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...ua5lle.jpg]
thanks sam
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 667
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Joined: Sep 2014
City: Bellmawr, NJ
SEEN,,a lot of these,,,it is a CRT Brightener,,,weak picture tube,,they put them on,,going DARK
Posts: 2,572
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
need little crt info
at Kutztown I picked up a philco 50-t1402 for 20. for a parts set doubted if crt was good at that price
looks almost identical to my 50-t1403
witch my crt was dead . but i bought one off arf member have not checked it yet
but I hooked up 402 to my surprise I think its good ?
turned on center light lite and then right lite flickered. and longer I left on it got bright and other test checked ok
hopefully I am doing this right. think I seen bob on his youtube channel say you have to cook
it for a while . I think that mean leave tester connected to crt for awhile ?
[Image: http://i1303.photobucket.com/albums/ag14...vbe9vl.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...i9iwbf.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...fhao4j.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...rbyynv.jpg]
thanks for any help sam
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 7,288
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Joined: Dec 2009
City: Roslyn Pa
Have had crts that are dim when first turned on but can produce a viewable pic after 5 or 10 minutes. I would deem this one weak but usable till a better comes along.
With all vacuum tubes what happens is over it's life cycle of use is that the heat/cathode looses it's ability to produce the original amount of electrons. One way to compensate for this condition is to increase the voltage on the heater.This in turn gets the cathode hotter and dissipate more of the needed electrons.
The down side is that it over taxes the heater and cathode causing their demise to quicken.
This is what the crt brightener does. It's a small step up transformer that takes the 6.3vac going to the crt filament and boosts it up a volt or so.
On your crt tester you may have a button to press to rejuvenate the crt. This applies a HV pulse to some of the elements in the crt to clean them off. This may help some but it seems likely that the main issue is the cathode emission.
Terry
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City: Sandwick, BC, CA
Sam;
Brightener or not the heater in the CRT should still light up, if it does not I would have a go at resoldering the applicable pins. In fact I would consider removing the CRT base altogether if it's in any way loose, and testing from the lead wires directly. If the picture tube was replaced in 1964 that was pretty late in the game, it couldn't have been operated for many hours after that point, sometimes crappy TV repairmen would slap a brightener on just to make a few bucks or compensate for another defect.
Regards
Arran
Posts: 2,572
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City: lawrenceville nj
hey guys
the crt that was in the t1403
when tested did nothing dead tag on it says 1964 replaced
as arran stated check pins and base. base was little loose and noticed pin 2 and 3 hmm
(note pins 2 and 3 should have continuity ) it has nothing here
removed base wires good and strong cleaned up retest still nothing. take it this is junk
[Image: http://i1303.photobucket.com/albums/ag14...i9zrcm.jpg]
on another note . the spare tv I bought for 20.00
and spare crt I bought for 130.00 test the same way in the good
sam
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 7,288
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
(06-01-2016, 03:05 AM)Arran Wrote: Sam;
Brightener or not the heater in the CRT should still light up, if it does not I would have a go at resoldering the applicable pins. In fact I would consider removing the CRT base altogether if it's in any way loose, and testing from the lead wires directly. If the picture tube was replaced in 1964 that was pretty late in the game, it couldn't have been operated for many hours after that point, sometimes crappy TV repairmen would slap a brightener on just to make a few bucks or compensate for another defect.
Regards
Arran
Could be what the customer wanted to get a few more years out of it. Like a second car. By 1964 there where a number of COLOR shows on the airwaves and color sets where gaining popularity. In the early '70s is when the b/w to color set change over (customers purchased color set and dumped the b/w) They were pretty expensive at $500-1000 in '64 dollars. You could get nice B/W set for about half that. Sorry forgot the u.
Terry
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City: Annapolis, IL
The tube might have had a poor vacuum if it was rebuilt, or a hairline crack. Ditto if it is a metal tube. Many of those had a bad glass-metal seal and took on air. Dead.
If I could find the place called "Somewhere", I could find "Anything"
Tim
Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44
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