Picture tubes--rate them...

[dieseljeep]

Originally Posted by rca2000

SOMEONE made an "attempt' at a 22" color tube, in 1957. A couple of members have sets with them. I THINK they have a "big neck" like a roundie. It was either sylvania or westinghouse, I think.

I understood, that it was CBS-Hytron that built that CRT. They also built the 19" tubes for CBS Columbia, Motorola and Raytheon.
They were one of the patent holders for the tri-color phosphor dot design.

[DavGoodlin]

Originally Posted by dieseljeep

I understood, that it was CBS-Hytron that built that CRT. They also built the 19" tubes for CBS Columbia, Motorola and Raytheon.
They were one of the patent holders for the tri-color phosphor dot design.

Was it a 19VP22 that Motorola used in its 1957 color set? That was also a troublemaker. I think there was a kit to convert the set to a 21AXP22.

[David Roper]

The 19VP22 was only used in 1954-55 sets. By 1957 those sets were already getting the 21AX conversions.

Wherever the 22" rectangular color tube came from, only Westinghouse ever offered it in a production set.

[andy]

...

[DavGoodlin]

Originally Posted by andy

I've never been a fan of the low focus voltage CRTs that were popular in many of the early color portables. A really strong tube looks decent (still not as good as a normal CRT), but they lose focus very early in life. Sets using them usually don't even have a focus control. There were usually 3 voltage taps that you could plug a jumper into. The settings were blurry, less blurry, and more blurry. Fortunately, they stopped making them by the mid 70's. Even the late model Portacolors switched to a high focus voltage CRT with a voltage divider connected to the anode.

Yes! I almost forgot how difficult it was to get good sharp focus on the 11WP22 used in GE sorta-color and 15LP22 used in the RCA CTC22.

[dieseljeep]

Originally Posted by andy

I've never been a fan of the low focus voltage CRTs that were popular in many of the early color portables. A really strong tube looks decent (still not as good as a normal CRT), but they lose focus very early in life. Sets using them usually don't even have a focus control. There were usually 3 voltage taps that you could plug a jumper into. The settings were blurry, less blurry, and more blurry. Fortunately, they stopped making them by the mid 70's. Even the late model Portacolors switched to a high focus voltage CRT with a voltage divider connected to the anode.

I like the way you described the focus settings.
I owned an early model CTC22, that was only a few months old, when I got it and was amazed, with the picture. It was razor sharp!
I never was impressed with the picture on the CTC36, or the CTC53.
As said before, When the CRT's aged, it was harder to get sharper focus.

[Tom S]

Originally Posted by dieseljeep

No Tom S. I was referring to Tom Carlson's post, regarding the big neck Toshiba.

Oh Ok Sorry, understand.

[Alastair E]

Originally Posted by DavGoodlin

Yes! I almost forgot how difficult it was to get good sharp focus on the 11WP22 used in GE sorta-color and 15LP22 used in the RCA CTC22.

Ah--Reading That takes me back a bit! Years ago I had an American built for the UK market a set called a 'Teleton' It was a 12 or 14" set with a delta type CRT and full of valves although it was actually a hybrid set, with a modified NTSC to sorta simple PAL decoder--Had horrible colour rendering too
(I think these sets gave the UK based TV Trade joke--Never Twice Same Colour--NTSC....!)

--I have no idea who actually made the set, but that had one of those horrible unipotential CRT's that were popular in the 70's no focus-control-The CRT was tired and dark with terrible focus when I had it, even re-juvenating didnt help much....

There were a few UK made and Japanese sets that used them too, Horrible focus on 'em.

I did actually modify an Hitachi set that used a unipot CRT and fitted a Mullard A56-120X, a 22" Delta gun high-focus tube and IMO probably the best European CRT ever made. The picture difference was astounding!
--I took a HV diode from input to tripler and used a Grundig 'Metrosyl' focus-control, Worked brilliantly.

Sure there's an American equivalent to the A56-120X with a number like 560HWB22,--or summit but forget the actual number--I do remember the '560' and the '22' but forget the important type letters....

[Electronic M]

The first numbers on US CRTs are screen size in inches so there would be no American tubes ###XXP22 unless that failed 'convert to metric' movement managed to hit our electronics industry.

[dieseljeep]

Originally Posted by Alastair E

Ah--Reading That takes me back a bit! Years ago I had an American built for the UK market a set called a 'Teleton' It was a 12 or 14" set with a delta type CRT and full of valves although it was actually a hybrid set, with a modified NTSC to sorta simple PAL decoder--Had horrible colour rendering too
(I think these sets gave the UK based TV Trade joke--Never Twice Same Colour--NTSC....!)

--I have no idea who actually made the set, but that had one of those horrible unipotential CRT's that were popular in the 70's no focus-control-The CRT was tired and dark with terrible focus when I had it, even re-juvenating didnt help much....

There were a few UK made and Japanese sets that used them too, Horrible focus on 'em.

I did actually modify an Hitachi set that used a unipot CRT and fitted a Mullard A56-120X, a 22" Delta gun high-focus tube and IMO probably the best European CRT ever made. The picture difference was astounding!
--I took a HV diode from input to tripler and used a Grundig 'Metrosyl' focus-control, Worked brilliantly.

Sure there's an American equivalent to the A56-120X with a number like 560HWB22,--or summit but forget the actual number--I do remember the '560' and the '22' but forget the important type letters....

I would like to see a picture of the U.S. built set with the pseudo PAL decoder.
Maybe it was a Japanese firm, that wanted a place in the European, British market. Japan uses a form of NTSC.
The Kuba Porta-color that everyone refers to, has no resemblance to the U.S. model, outside of the cabinet, CRT, yoke, convergence assembly and flyback transformer.
BTW, that's what makes this hobby interesting.

[Alastair E]

Originally Posted by dieseljeep

I would like to see a picture of the U.S. built set with the pseudo PAL decoder.
Maybe it was a Japanese firm, that wanted a place in the European, British market. Japan uses a form of NTSC.
The Kuba Porta-color that everyone refers to, has no resemblance to the U.S. model, outside of the cabinet, CRT, yoke, convergence assembly and flyback transformer.
BTW, that's what makes this hobby interesting.

Sadly, My Teleton is long gone, but here is a thread on a UK forum of the same model set, there's a PDF link that explains the weird decoder they had....

http://www.vintage-radio.net/forum/s...ad.php?p=72223

Maybe I'm wrong about it being a USA made set--Possibly it was some Japanese or maybe even Chinese origin set!

--It just sorta Looked USA made to me at the time years ago, Steel cabinet etc,--, Has all USA designation valves, like 17JZ8, 3AT2 etc....

[dieseljeep]

Originally Posted by Alastair E

Sadly, My Teleton is long gone, but here is a thread on a UK forum of the same model set, there's a PDF link that explains the weird decoder they had....

http://www.vintage-radio.net/forum/s...ad.php?p=72223

Maybe I'm wrong about it being a USA made set--Possibly it was some Japanese or maybe even Chinese origin set!

--It just sorta Looked USA made to me at the time years ago, Steel cabinet etc,--, Has all USA designation valves, like 17JZ8, 3AT2 etc....

Many thanks for the information!
I was hoping that you could source this information.
The set was made by General of Japan, as stated in the theory text. They were never a big player in the U.S. market, although, I did work on a few of their products. The small screen B/W Philco, that Ford sold with the Mustang logo, was General sourced. Everyone here knows what that set is worth.
Regarding the valves, Panasonic was the only Japanese concern that used, what we would consider to be Euro-valves in their products. Motorola seemed to run a close second.