Fascinating film about 1960s colour CRT manufacturing

[Mike Harrison]

https://www.youtube.com/watch?v=7IrSLPVkxCo

[Yohan Park]

Enjoyed watching that, thanks for sharing.
Any idea what the large round tubes were used for back then?

On Thursday, January 7, 2021 at 1:40:27 PM UTC+1 mikeselectricstuff wrote:

https://www.youtube.com/watch?v=7IrSLPVkxCo

[Bill van Dijk]

I believe the round tubes were for the cheaper TVs.

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[Yohan Park]

Yes you're right.
At the end of the documentary at 19:15 you can see a man testing a TV with a round tube.

[orange_glow_fan]

When Color TV's first came on the market in the early 50's all of them had round CRT's. The first ones were 15" CRT's. Around 1954 RCA introduced a 21" round CRT and they were the standard until around 1963 when the first rectangular CRTS entered the market. I suspect this film was made during the short  time when both versions were available. The first practical, consumer color tv was introduced by RCA in 1953 and they sold about 4,000 of them at a cost of $1,000, about $8,000 dollars in 2021 dollars...

[Adrian Pardini]

Nice video.
I have a couple of chart recorders like the ones used there while
checking the metal strips.

On Thu, 7 Jan 2021 at 09:40, Mike Harrison <mi...@whitewing.co.uk> wrote:
>
> https://www.youtube.com/watch?v=7IrSLPVkxCo
>
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[Bill van Dijk]

An electron cannon emits electrons in a very narrow straight beam, which is (was) than magnetically deflected by heavy electromagnets mounted on the neck of the tube. If you create  a deflection circuitry with a deflection equal in all directions, you get a circle. Hence the round screen. In order to make it rectangular the power and accuracy required to accurately push the electron beam in the corners requires much more powerful and complicated circuitry, and therefore a more expensive TV.

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[gregebert]

After watching that video, I feel more guilt about how I loved to throw them into the local storm drain just so we could hear the BOOM !  The addiction got so bad that I would sometimes ride my bike to the local TV repair show, grab a tube from the dumpster, and ride home no-hands (yes, can you believe how stupid someone can be to ride a bike carrying a glass picture tube...) just so I could break it.

We did a not-so-nice dissection of a 21FJP22 tube in the mid 1970s. It started out by breaking the neck with a CB antenna. We covered the neck with a small rag to reduce glass-shatter, but the rag got sucked into the tube from the vacuum!     Since we could not get the rag out, we tossed some bits of paper, twigs, and squirted-in some charcoal lighter and proceeded to burn-out the rag. Surprisingly, the small fire was barely visible from the front of the TV. Fearing his parents might smell the smoke, we got the garden hose and put out the fire. When the father came out to ask if we found out what we wrong with the TV, we said it has leaked water inside from condensation. You have to understand that his father taught English, not science, so he accepted that explanation. OK, so what do you do with a half-broken TV tube ? We broke-away most of the thinner glass (the funnel-shaped structure from the film), but once we got to the face, the glass got very thick. So, that was taken out to the front yard and chopped into bits with an axe. Nice to know the front was safety glass, but that made the job more difficult. We had fun tearing-away the shadow-mask with pliers. It literally tore away like cloth.

Thanks for posting the video; it really makes you appreciate what went into those tubes.

[Yohan Park]

Ha ha ha, great story :)
Well, it's al about how we take today's technology for granted and don't care if it breaks isn't it?
I have a couple of "out of date" phones lying around and wouldn't feel bad if I blew them up some way. Just for fun.
But 30 years from now people probably will look at it and scream "nooooooo, how could that guy be setting fire to an iPhone 5?!!!"
It's just how it works.
But if you're smart, have patience. Nearly every piece of tech will be worth more than it is today 15 years from now...
(ignore that last sentence if you're 90+ years old)

[Instrument Resources of America]

The same was true about black and white crt's, all were round for quite some time. IIRC the first 21" round color crt was a 21AXP22?   Ira.

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[orange_glow_fan]

Ira and....

The first round color crt was the 15AXP22 which came in the RCA CT-100. The first 21" round crt was the 21AXP22 which was unique because, unlike its predecessor it had a metal funnel/bell instead of a glass one. That metal bell carried the 2nd anode voltage and could really carry a punch to the unsuspecting technician....don't ask how I found out...more than once.... The 21FBP22 and 21FJP22 were the first all glass 21" color CRT's.  The difference between the 21FJP22 and the 21FBP22 is that one had a bonded/slightly frosted safety plate, the other did not and was mounted behind a clear glass safety plate...Despite the issue of reflections, I always felt the version with the clear glass had a sharper picture.....

[gregebert]

Does anyone still have a functioning TV with a CRT in it ? I'll bet you can get nixies to glow by holding them in front of the glass, especially if you are touching some pins.

There's enough charge in the HV area to give a mild zap when you touch the screen, due to body capacitance.

So many things I remember, and utterly HATE, about those old TV's........

[martin martin]

I have one of this plasma glowing orbs

When I touch the glass with a Nixie they do glow nicely 

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[J Forbes]

Of course I do....hopefully for only a short time. I have 4 of them, plus 3 monitors. All in the garage waiting for the big moving sale.

[Mac Doktor]

On Jan 11, 2021, at 10:14 PM, J Forbes <jfor...@gmail.com> wrote:

Of course I do....hopefully for only a short time. I have 4 of them, plus 3 monitors. All in the garage waiting for the big moving sale.

I'll take any monitors 19" or bigger as long as the shipping is free.  8D

My 19" Trinitron isn't going anywhere. I need it for legacy machines.  lt's too heavy to lift right at the moment, anyway. I strained my shoulder manhandling a 14" earlier today.  8/

It's not the years, it's the mileage. I keep telling myself.  o_O

Terry Bowman, KA4HJH
"The Mac Doctor”

"Never install version point-zero of anything"

[Alex]

Crt monitors are getting very collectable, especially Sony Trinitrons. I used to pick pvm monitors up for free from a recycling place and made a wall of them at the back of my workshop. Cleared most of them on eBay last few years, most for over 200gbp each... Even good Trinitron pc monitors are getting good 3 figures now. It's mainly the retro gaming community, SNES and megadrives just don't work well on LCD / digitising monitors due to their habit of skipping every other scanline for processing, plus the lag is noticeable...

The high end bvm crt monitors are always over 1k now!

[Ryan B]

I have about 30, only a few don't work. Most are 5.5" BW portable sets. I collect them. Recently got rid of a bunch. Sold one to a guy and when I asked him what he was going to do with it, he said, nothing. I just collect them!

[H. Carl Ott]

Some of the gents from the local Antique Radio group certainly collect CRTs.

 Here's a pic from a swap meets back in 2019. 

  

  https://photos.app.goo.gl/cXshNfrrEXGtBgkj8

These older sets have given me ideas for possible future clock designs.

  

carl

--------------------------------------------------------
Henry Carl Ott   N2RVQ    hcar...@gmail.com

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[Yohan Park]

Around 2 months ago I was about to go home from work and noticed a dumpster behind the school (where I work).
Turned out they were clearing out the old studio and engineering room and they had tossed 6 Sony BVM monitors in the dumpster.
I immediately ran to one of my co-workers who makes arcade cabinets and we saved them all. Unfortunately some of them had quite some damage because they were just thrown on top of each other but luckily they were all still working.
Boy was I angry at the guy who decided to throw them away.

[Robert G. Schaffrath]

I have a 15" Micron branded Trinitron monitor that I purchased back in 1999 for around $130. Used it for many years. I eventually switched to an LCD and brought the monitor to the office for safe keeping. We eventually ditched all of the CRT based monitors at the office except for one on a rarely used server and my Trinitron. Boss keeps suggesting I toss the Trinitron but I still like to use it with certain old computers. Was always a fan of the Trinitron technology as the picture always appeared to be more vivid and clear to me. Had a Sony KV-1710 and later a Sony KV-1972R TV. Kept the KV-1972R going for years. Speaker blew in the late 1980's and I got a new one from Sony. In December 1994, the combination power supply/audio amplifier module partially blew reducing the high voltage supply so the picture shrank. A local electronics dealer had a Sylvania branded plug compatible replacement module that fixed it. Then in mid-2008, the flyback transformer blew in a cloud of smoke. I already had a flat screen TV but I liked the Sony as a backup. Found a cheap replacement transformer and got it working again. However, around late 2011, the TV started having odd power problems and I suspected bad caps. At that point I had owned it 26 years and decided its time was up.

[Paul Andrews]

I have a whole bunch of Predictas. I'll try it but I doubt it will work because of the large gap between the CRT and the safety glass. Here are the two I have restored:

[gregebert]

For those of you not old enough to have had a black-and-white TV, you can see they were not actually white, but a bluish tint.

Very well preserved/restored equipment.

Not likely that I will replace our 70-inch 4K Sony with one of these

[Mac Doktor]

On Jan 12, 2021, at 3:50 AM, Alex <ajlg...@gmail.com> wrote:

Crt monitors are getting very collectable, especially Sony Trinitrons. 

In addition to the 19" Sony, I have three of the original 13" Trinitrons that were bespoke for Apple.

On Jan 12, 2021, at 5:29 PM, gregebert <greg...@hotmail.com> wrote:

For those of you not old enough to have had a black-and-white TV, you can see they were not actually white, but a bluish tint.

The original Macintosh computer had a CRT with a greenish-blue cast. Sometime after the MacPlus came out Apple switched to a different CRT that was entirely blue and distinctly less sharp. The dot over the lowercase "i" was difficult to see in 9 point Geneva.

Terry Bowman, KA4HJH
"The Mac Doctor"

"If only you could see what I've seen with your eyes."—Roy Batty, Blade Runner

[Nicholas Stock]

Those Predictas are so sweet Paul....I'd love one of those, but fear I'd probably kill myself during the restoration process.... :)

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[Charles MacDonald]

On 2021-01-12 2:48 p.m., Paul Andrews wrote:
> I have a whole bunch of Predictas. I'll try it but I doubt it will work
> because of the large gap between the CRT and the safety glass. Here are
> the two I have restored:

you can get a neon lamp to glow at the Plate cap of the Horizontal
output tube, on tube TV sets. NO doubt a Nixie could also glow. while
their is a bunch of High voltage on the other side of a CRT screen, it
is DC and so will not give out a field. The CRT I am using to type
this hardly shows any static when it is running.

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[Paul Andrews]

Yes. That is a quick test to check that the horizontal is actually being generated.