CRT colors

[John Snow]

Is there a model line of CRT tube that's available in different colors?

Alternatively; know of any analogue oscilloscopes that came in different colors?

I'd like to put something together to display Lissajous curves - i'd much rather use monochromatic displays than color CRTs where I use only one channel.

[Charles MacDonald]

On 2020-05-29 8:17 p.m., John Snow wrote:
> Is there a model line of CRT tube that's available in different colors?
>
> Alternatively; know of any analogue oscilloscopes that came in different
> colors?

many of the makers did offer other phosphors in 'scope Tubes. BUT
normaly the effort was to control the persistence of the glow. Take the
P7 used fro Radar displays for example. a very short blue-ultraviolet
display, followed by a 2 second or more yellow glow. there was an
Orange long phosphor also in some lines.

Sylvania even made some tubes with a two colour phosphor - which one
glowed depended on a drive signal.

this link has scans of some of the standard versions from different firms.
http://w140.com/tekwiki/wiki/Phosphor


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Charles MacDonald VA3CPY Stittsville Ontario
cm...@zeusprune.ca Just Beyond the Fringe
No Microsoft Products were used in sending this e-mail.

[Mac Doktor]

On May 29, 2020, at 8:17 PM, John Snow <jrope...@gmail.com> wrote:

I'd like to put something together to display Lissajous curves - i'd much rather use monochromatic displays than color CRTs where I use only one channel.

Check this out:

https://www.astarcloseup.com/2016/02/the-oscilloscope-artist.html

I'd like to have a scope clock but I'm only interested in the vectored type, not rastered.

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com/

"Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact."—Carl Sagan, Psychology Today, 1996

[Nicholas Stock]

Standard colo(u)rs I have seen are Green (P1, P31), white (P4), blue (P7, P11) and orange (P12, P19)

https://en.m.wikipedia.org/wiki/Phosphor

There are some exotics (like red) that allegedly exist, but I’ve never found a CRT with a red phosphor (yet...:). 

For a good vector graphics based CRT clock check out Grahame’s Scope Clock Due (www.sgitheach.org.uk/scope3.html)

Nick

Sent from my iPhone

On May 29, 2020, at 18:09, Mac Doktor <themac...@gmail.com> wrote:



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[John Rehwinkel]

Standard colo(u)rs I have seen are Green (P1, P31), white (P4), blue (P7, P11) and orange (P12, P19)

https://en.m.wikipedia.org/wiki/Phosphor

There are some exotics (like red) that allegedly exist, but I’ve never found a CRT with a red phosphor (yet...:).

There are some purple ones out there like P16 flying spot scanner tubes.  I've seen red ones in flood beam and projection TV tubes.

- John

[David Forbes]

There are a variety of phosphors used in oscilloscope tubes. Here's a rundown:

P1 is the original green. It's long lasting.

P4 is white, faster. It's not common in smaller tubes, as it was used primarily for TV sets.

P7 is a radar phosphor with a fast blue glow and a yellow afterglow.

P11 is fast and blue.

P12 is orange.

I'm in the process of getting my scope clock back into production, with a laser cut case. I'm using a Teensy to make the circuitry simple, yet capable of lovely curved fonts as my original scope clock from 20 years ago, that set the bar.

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[Yuriy Ovchinnikov]

I can offer:

3LO1I – 62 pcs. for $15, - green

5LO38I – 3 pcs., - green

6LO1I – 7 pcs., - green

6LO2A – 2 pcs. - blue

7LO55I – 2 pc. - green

8LO29I – 47 pcs. for $20, - green

8LO30I – 1 pc. for $100, - green

8LO39V – 22 pcs. for $20, - blue

13LМ31V – 7 pcs., - orange

13LN2 – 1 pc. - orange-green

13LO18V – 1 pc., - orange-green

13LO36V – 1 pc., - white

13LO37I – 1 pc., - green

16LO2V – 29 pc., - blue

16LO2I – 1 pc., - green

18LМ5V – 1 pc. - red + green

23LM4V – 17 pcs. - white

суббота, 30 мая 2020 г., 3:17:14 UTC+3 пользователь John Snow написал:

[Grahame]

I would add P2 to David's list as they do appear on Ebay from time to time. Other P series phosphor's are hen's teeth. I did correspond with a guy who said he had an experimental red phosphor tube but I couldn't prise it out of his hands...

Another good list of P phosphors is here (and other CRT stuff)

http://www.bunkerofdoom.com/

And look under the heading CRT Focus a little way down the page for All About CRT Phosphors.

Don't get too excited by the range!

Another, different, range of colours is available using Soviet tubes. Attached is my own scavenged data. (This is incomplete, if anyone wants to add or make corrections then please PM me). Whilst a И designation (English I) is often described as green, the actual shade of green is different to a P1 or a P31. A very interesting colour combination is the B phosphor (English B). This is described as a rough, white light with a long yellow afterglow. They do appear on Ebay and there is no corresponding P colour. I like it.

My own scope clock that Nick linked is very much a "Son of David's" design using sine and cosine generators to draw Lissajous figures (rather than a Vector display as Nick suggested). The hardware is different but the principle is the same. The other Lissajous based clock that I know of is, of course,

https://oscilloclock.com/

Have fun! Keep safe!

Grahame

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[Oscilloclock]

I was just going to suggest the Bunker of Doom site, but Grahame you beat me to it!

It tends to be a bit difficult (or expensive) to find electrostatic deflection CRTs in some of the more exotic phosphors, especially new-old-stock, but persistence (excuse the pun!!) does prevail. And as you can see above the Russian ones can be obtained readily.

- Aaron

[Nicholas Stock]

I should have been a little more specific....vector 'like' graphics....i.e., not a raster based image (even then, I'm probably not being accurate enough....) :)

In my experience P11 is more purple than blue....check out the following phosphor colo(u)rs on a 5CPx

Here's a 5CP12 in all its orange glory

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[John Snow]

Followup - I can follow of the Soviet naming standards, I'm looking at (chinese?) 8SJ29J, 8SJ31J or 8SJ42J CRT tubes - is the difference between them just the serial, or is there a functional difference between them too?

[Oscilloclock]

John, I happen to have the specs for the 8SJ40x and 8SJ42x (attaching page 1 of each), and comparing them there is a substantial functional difference, from the voltages to the minimum useful screen dimension, etc.  Something like the (e.g.) DG7-nnn, where each nnn is really a totally different model.

BTW the rectangular useful screen dimension specification on these round CRTs can be a pain to work around, when pushing at the max voltages - as the beam certainly does hit the plates as expected. I didn't really relish using them and they were quite unattractive, so have only included them as 'sample' CRTs for Oscilloclock Core units in the past.

- Aaron 

[John Snow]

I appreciate you attaching those - I'll hold out for a specific 8SJ31J model to practice on.

[Bill Notfaded]

Check this out... this is where it's at in oscilloscope art!  Sound made specifically to make vector graphics on a scope.  Bad @SS!  https://www.youtube.com/watch?v=ZaTuFB5QXHo

Bill

[Bill Notfaded]

This guy Jerobeam Fenderson is a bad @ss!!!  https://www.youtube.com/user/jerobeamfenderson1