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#1
09-30-2012, 11:52 PM
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How to tell if a CRT is rebuilt?
This is a complete neewbie question, but here goes.
I am wondering if the CRT on my Sylvania Halolight is rebuilt. I found a label on the bottom of it (see attached picture, sorry one is upside down but you can read it better) that says near the end, "This tube employs a used glass envelope". It could be my naivete but since it says "used" refering to the tube on the label would that have been put on after it was rebuilt? I did look up how it was done and see the neck is cut off in the process and a new gun installed with the neck re-conneced. There is an area with a slight ripple feel to it on the neck that could be the seam from this, but I am not sure. It is hard too see in a picture, easier to feel, but I attached a picture of the neck too. Or am I completly in left field? There is no makers mark on the plastic end of the tube either. Just the tube size on a label on the side, also included in the attached pictures. Thanks. Tom 
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#2
10-01-2012, 12:05 AM
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Yes, that is a rebuilt tube. That ripple area is where the cut and re-mounted the new gun assembly. That generic label gives it away. That paint writing on the CRT is not from the factory. You will notice one that looks burnt and the other newer. Looks like after the original labels were removed, they kept track of the model by writing on it but obviously it got burnt so they wrote it back on after it was removed from the furnace and before they slapped a new label on. Most rebuilds say "This tube employs a used glass envelope"
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#3
10-01-2012, 12:18 AM
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Thanks for the reply, I was hoping so!
It tests very good and I am guessing does not have a lot of hours on it. This will be my first restoration of a TV and looking over the chassis it has all original wax caps and bumblebee's with no evidence of recent work on it. I did find the horizontal output tube was cracked and had white deposits in it indicating someone ran the set after it broke so they may have just "put it out to pasture" after that and never tried to get it fixed again. The high voltage fuses were still good too, so this may be a very promising canidate for restoration. Thanks again. Tom
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#4
11-08-2012, 01:56 PM
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I suspect that after a CRT type fell out of popularity, that there were no new versions of it being made. Even RCA reused glass envelopes for their Silverama tubes. Yet some Silverama tubes clearly stated "all new materials" on the box. I doubt there were any new evelopes being made for 10BP4's or 12LP4's into the early 60's. And to think that we used to drink soda from rebuilt bottles.
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#5
11-11-2012, 02:11 PM
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There were different grades of rebuilt tubes, on the Grade "A" everything except the envelope was new, new phosphor, new Coating inside and out, new Gun and maybe Aluminizing as an upgrade, essentially a new tube.
Cheaper rebuilts just got a new gun, and new outside coating but the Phosphor was reused, and probably somewhat less efficient, possibly with some minor defects in the screen. Similar to the difference between Remanufactured and Refurbished. These days I'm happy to get anything, rebuilt, refurbished, used, as long as it's good!
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#6
11-11-2012, 05:47 PM
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Quote:
This CRT tested very good on my B&K 466 so I am happy with it. I am in the process of recaping now, after a break to do a radio for my Dad for Christmas. Hopefully I will have pictures posted of the working set in a month or two. Tom
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#8
11-16-2012, 08:58 AM
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Quote:
Possibly others did it as well.
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