21fb j p22

[timmy]

Who made the 21fb or fj p22 crts in 1965 or during the 60s was this tube kind of proprietary to rca and we’re all these tubes made by thompson electronics and put different names on them.

[timmy]

Or did Motorola and sylvania and zenith produce there own tube for their sets.

[Electronic M]

Zenith/rauland made their own, RCA did, and so did Sylvania. Easiest way to know who REALLY made a tube is to look up the EIA number on the label. I've seen Zenith labeled roundy tubes that had Zenith, Rauland (Zenith subsidiary) and RCA EIA codes. The RCA tube appeared to be early into Zenith selling roundys.

During the color TV shortage of IIRC 1967 the smaller makes used any CRT they could pay hands on and sometimes the big makes would use each other's CRTs if in house production couldn't keep pace with set orders.

[julianburke]

[QUOTE=Electronic M;3253618]Zenith/rauland made their own, RCA did, and so did Sylvania. Easiest way to know who REALLY made a tube is to look up the EIA number on the label. I've seen Zenith labeled roundy tubes that had Zenith, Rauland (Zenith subsidiary) and RCA EIA codes. The RCA tube appeared to be early into Zenith selling roundys.


Many years ago the CRT's were in somewhat short supply. If you made your own tubes you were in the drivers' seat for making as many sets as you wanted. Smaller manufacturers had to depend on what ever they could get ie; Curtis Mathis and others like them. Yes, they also traded around as in contract marketing. Smaller vacuum tubes were also treated and traded the same way.

[timmy]

So Motorola could have been made by rca or the other

[Electronic M]

Originally Posted by timmy

So Motorola could have been made by rca or the other

IIRC Motorola had in house CRT production facilities. They developed the first basically successful rectangular color CRT the 23EGP22 and we're one of the suppliers of it. I would expect that they produced some roundy color tubes before developing it as it's easier to refine an existing technology you know than one you don't know.

[old_tv_nut]

The earliest Motorola roundies used 19 inch outside diameter CBS tubes. Adapter kits were later made to allow substitution of 21 inch tubes.

i realize now that I don't know if Motorola ever made their own 21 inch round tubes. Their rectangular tube was a joint project with National Video, and Motorola definitely did manufacture those.

[nasadowsk]

The 23EGP22 was basically successful? Ok, I mean, it worked, but wasn’t it kind of a dud?

[timmy]

Overall I was wondering if any of the companies that manufactured the round 21 inch tube we’re any better then the other. Who maybe built a longer lasting tube ? My experience with sylvania tubes were not good. The other question is was the rca hi lite made better or improved from the earlier versions. Not so much the rare earth materials but rather the gun itself.

[Electronic M]

Originally Posted by nasadowsk

The 23EGP22 was basically successful? Ok, I mean, it worked, but wasn’t it kind of a dud?

In 1958 CBS rolled out a rectangular color CRT that was so lousy they ended up recalling almost all the sets made using it (3 survivors are known).
Compared to that the 23EGP22, which had longevity issues from bad manufacturing, and weird phosphor colors that made accurate color hard to achieve, was basically successful in that the sets actually DID work from new and weren't recalled.... While the EGP wasn't the first rectangular tube to market and wasn't the best, one can argue it was successful compared to the 1958 CBS tube.

Originally Posted by timmy

Overall I was wondering if any of the companies that manufactured the round 21 inch tube we’re any better then the other. Who maybe built a longer lasting tube ? My experience with sylvania tubes were not good. The other question is was the rca hi lite made better or improved from the earlier versions. Not so much the rare earth materials but rather the gun itself.

Sylvania I sort of regard as the best and worst color CRT maker.....They had a great phosphor formula that yields BEAUTIFUL color on the one Sylvania round tube I have and some of their rectangular tubes were comparably beautiful in action, but the guns were not as long lived as most other brands... I'd argue Sylvania color tube longevity was among the worst of the big players in the industry.

RCA and Zenith tubes tended to have good life and good performance. For RCA Hi-Lite was the newly built high quality label and Colorama was the lower tier rebuild stuff.

I think I heard the screen grading went all the way to grade E and that most of those were test Jig CRTs.

[Yamamaya42]

The 21FJP22 in my GE made RCA CTC 15/16 clone has a RCA tube in it, but it's of a lower quality than you would have seen in an RCA or Zenith, GE most likely used tubes that RCA rejected, this one has a tiny but noticeable flaw in the shadow mask.

[timmy]

Originally Posted by Yamamaya42

The 21FJP22 in my GE made RCA CTC 15/16 clone has a RCA tube in it, but it's of a lower quality than you would have seen in an RCA or Zenith, GE most likely used tubes that RCA rejected, this one has a tiny but noticeable flaw in the shadow mask.

Wow these tubes were far from perfect to begin with they didn’t seem to last very long maybe it’s because of the materials that were available at the time but to call it a defect of sorts for just a mark on the mask.

[Yamamaya42]

From what I understood, there were different levels of quality in these tubes, grade A or B CRTs or even grade C, for a cheapo low grade TV, a top line RCA or Zenith would have a top quality grade A tube, and clones have tubes that did not meet the standard of A would have B or C, replacement tubes in shops would often also be B or C, unless one payed a premium for an A.
The one in my GE is clearly a B or C because of the mask flaw in the middle of the screen.

[timmy]

Originally Posted by Yamamaya42

From what I understood, there were different levels of quality in these tubes, grade A or B CRTs or even grade C, for a cheapo low grade TV, a top line RCA or Zenith would have a top quality grade A tube, and clones have tubes that did not meet the standard of A would have B or C, replacement tubes in shops would often also be B or C, unless one payed a premium for an A.
The one in my GE is clearly a B or C because of the mask flaw in the middle of the screen.

Well hopefully I have a grade a in this Motorola I have. Even if it was grade a it’s still old and old stuff don’t last forever.

[Yamamaya42]

Well, I don't believe that a grade A will last longer than a grade C, or vice versa, they were all most likely made in the same plants, from the same materials in the same way by the same people, it's more like a matter of that any given build of tube where the electron gun assembly, and / or shadow mask to screen placement was just a micron off of what may be considered grade A tolerance, making it harder to get ample convergence / purity w/o going beyond a set boundary, or, like in the case of the tube I have, a minor minuscule flaw in the phosphor or shadow mask that causes a tiny blemish that most won't notice unless you really look for it! :P