P12 Phosphor CRT

[Grahame]

Here's Nick showing off a Scope Clock with an orange P12 phosphor CRT.

https://www.instagram.com/p/B8PIw20HkmH/

[Jon D.]

Very nice !!

Jon J.

[jb-electronics]

Beautiful! There is just something about these phosphor CRTs...

[Mac Doktor]

> On Feb 9, 2020, at 11:39 AM, jb-electronics <webm...@jb-electronics.de> wrote:
>
> Beautiful! There is just something about these phosphor CRTs...

I have a variety of these. CRTs I mean, not the clock*. The best one is the tube inside a video test pattern generator. The flying-spot scanner has very fast phosphor that's purple. Too small for this application, though. OTOH, it does have the test pattern with the Native American.

*I'd really like to have one of THESE clocks. Hint, hint.


Terry Bowman, KA4HJH
"The Mac Doctor”

"Never install version point-zero of anything"

[Ian Vine]

That is good

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.

[Jack Buechler]

I note, rock solid numerals whilst the pendulum is swinging.

Good job.

On 09/02/2020, 19:56, "'Grahame' via neonixie-l" <neoni...@googlegroups.com> wrote:


Here's Nick showing off a Scope Clock with an orange P12 phosphor CRT.

https://www.instagram.com/p/B8PIw20HkmH/

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[Oscilloclock]

Exquisite, Nick!!

- Aaron

[Alex]

Which model of CRT tube is that, as it is a nice size?

For that matter, what commonly available tubes had P12 phosphors as it is a very pleasing colour (probably why it was used in later computer terminal dispplays I guess...)

I do like the sharpness of the numerals on that clock, very cool.

[Paul Andrews]

I just got a B&K 1077B that has one of those purple phosphor tubes. I intend to use while repairing TVs, but now you have given me ideas!

[Nicholas Stock]

Hi Folks. It’s a 5CP12 tube....has engineering sample sticker, so not sure how common a phosphor this was...

Here’s a picture of the other colours..

The P11 is quite a shocking purple!

Sent from my iPhone

On Feb 10, 2020, at 04:58, Paul Andrews <pa...@nixies.us> wrote:



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[Toby Thain]

On 2020-02-10 10:34 AM, Nicholas Stock wrote:
> Hi Folks. It’s a 5CP12 tube....has engineering sample sticker, so not
> sure how common a phosphor this was...
>
> Here’s a picture of the other colours..
>
>
>

> The P11 is quite a shocking purple!
>

Nice pics. Just curious what circuitry you're using to generate the signal?

Thanks
--Toby

[Grahame]

It's my scope clock

http://www.sgitheach.org.uk/scope3.html

Grahame

[Nicholas Stock]

Other tubes with P12 phosphor are 3JP12’s as far as I can tell. Some of the datasheets for others say they were available as P12, but I rarely find them for sale anywhere....

Sent from my iPhone

> On Feb 10, 2020, at 07:56, 'Grahame' via neonixie-l <neoni...@googlegroups.com> wrote:
>
> It's my scope clock

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[Toby Thain]

On 2020-02-10 10:55 AM, 'Grahame' via neonixie-l wrote:
> It's my scope clock
>
> http://www.sgitheach.org.uk/scope3.html
>

That's fantastic! Thankyou for the link. Vector graphics is my main
project (as an electronics learner) so this is very inspirational.

--Toby

[David Forbes]

I made a clock with a 3JP12 back in 2002 when I was doing that. It lasted a few weeks. That phosphor is rather delicate!

BTW I am working on getting back into the scope clock business, making a laser cutter for the cases and using a Teensy to do the X-Y signal generation. I've already written the code; its DACs are excellent for this job.

On Sun, Feb 9, 2020, 8:56 AM 'Grahame' via neonixie-l <neoni...@googlegroups.com> wrote:

Here's Nick showing off a Scope Clock with an orange P12 phosphor CRT.

https://www.instagram.com/p/B8PIw20HkmH/

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[Nicholas Stock]

Would seem an odd phosphor to use for radar displays then...maybe you had a bad tube?

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[Ian Vine]

OMG that purple tube is awesome. Anybody got any for sale ?

Cheers

Ian

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[Nicholas Stock]

P11 phosphors aren't too common either I've found.....if you find a stash please let me know! :)

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[David Forbes]

I have a carton of 3ACP11 tubes. Interested? I'll dig them out.

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[Nicholas Stock]

Yep! PM me please

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[Dave ZL3FJ]

Keep in mind the B&K flying spot scanners use electromagnetic deflection CRTs.

DaveB, NZ

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[Mac Doktor]

On Feb 10, 2020, at 12:01 PM, David Forbes <nixie...@gmail.com> wrote:

I made a clock with a 3JP12 back in 2002 when I was doing that. It lasted a few weeks. That phosphor is rather delicate!

BTW I am working on getting back into the scope clock business, making a laser cutter for the cases and using a Teensy to do the X-Y signal generation. I've already written the code; its DACs are excellent for this job.

Sounds excellent. Can't wait to see it.

[Charles MacDonald]

On 2020-02-10 11:05 a.m., Nicholas Stock wrote:
> Other tubes with P12 phosphor are 3JP12’s as far as I can tell. Some of the datasheets for others say they were available as P12, but I rarely find them for sale anywhere....

the description from JEDEC says P12 was intended for radar. see attched)

some REGISTERED at P12 include 5CP12,5AJP12,7LP12,16AFP12, 7AGP12,
3ACP12A, 19Wp12, 3BMP12, 17QCP12, 12AWP12, 5EKP12, 19DXP12.

the larger sizes are consistent with Radar use.

Sylvania or Dumont in Particular advertised that they would build ANY
CRT with any available phosphor given a suitable sized order, so
presumably any scope tube could have existed as a P12 - (or P7) version.

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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.

[Nicholas Stock]

Thanks Charles....I have a couple 7AGP19's, but not P12's....need some beefier deflection amps to drive those. Not seen any 5AJP12's...I do have some 3JP12's.

I found some 5ADP20's....was quite disappointed with the color of those to be honest.

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[Paul Andrews]

Please stop it. I don’t even have enough room for my current toys, nor time to work on all my projects. I don’t need more distractions!

[David Forbes]

In case you're wondering, I first made a scope clock in 2001, using a 3BP1 tube and an analog Lissajous circle generator.

I eventually ran out of custom power transformers, and redid the design in 2008 with a new generation of circuitry. 

I am working on an updated design using a Teensy to generate the circles in software, using its fast dual DAC. 

This project has expanded in scope to the building of a laser cutter to make nice cases, and a new workshop to house the laser cutter. Whew!

I hope to have kits available in a few months.

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[Instrument Resources of America]

That's exactly what I've stated in several previous emails, but I'm not
sure that they went through. YES!! P12 is an orange, medium-long, to
long, persistence phosphor, primarily intended for radar use, such as
Plan Position Indicators, PPI's. To this day don't know how the radar
men, on the ship that I was on, sat there in front of those PPI's for up
to eight hours at a time, without having their eyes bug out, or go
batty.    Ira.

[Richard Scales]

+1 for stopping this temptation right now - I want it - I just know I cant have it, desist - step away from the discussion!

Perhaps a new group is required - one which I would not be allowed to join.

[Robert G. Schaffrath]

I recall an article I read years ago about the old RADAR tubes and phosphors used. There was a RADAR scope tube that had a mix of two phosphors. One phosphor produced a short persistence bright blue light from the target and the other was the longer persistence P12 type orange phosphor that was excited by the blue phosphor hung around after the blue faded and was refreshed by another "ping" of blue light from the target. An orange filter was placed in front of the tube face to filter out the blue flash which would have been very distracting to the operator.

[Instrument Resources of America]

The date today is the '12th',,,,,,,,,,,,,,,,,,,,,,is this an omen to buy P12 CRT's???????  Could be!!!      Ira.

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[Mac Doktor]

On Feb 12, 2020, at 12:20 PM, Robert G. Schaffrath <robert.s...@gmail.com> wrote:

I recall an article I read years ago about the old RADAR tubes and phosphors used. There was a RADAR scope tube that had a mix of two phosphors. One phosphor produced a short persistence bright blue light from the target and the other was the longer persistence P12 type orange phosphor that was excited by the blue phosphor hung around after the blue faded and was refreshed by another "ping" of blue light from the target. An orange filter was placed in front of the tube face to filter out the blue flash which would have been very distracting to the operator.

While we're on the subject, I have a five beam CRT that I snagged on ebay a few years ago. The auction listed the part number as "JAN CGV 7YP2" but the number on the box is "JAN CDU 7YP2" and the date is "195"-something. 

I'm told came from a Navy radar system and that it's the only one ever made with more than four beams. It would be interesting to hook that baby up to five different gadgets at the same time. 8D

Terry Bowman, KA4HJH
"The Mac Doctor"

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

[Nicholas Stock]

I bought a similar one that allegedly came from Los Alamos...5 gun. I think they made tubes with more guns than that even.

For those interested in CRT's, this is a cool little website..

https://www.crtsite.com/index.html

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[Mac Doktor]

On Feb 12, 2020, at 5:12 PM, Nicholas Stock <nick...@gmail.com> wrote:

I bought a similar one that allegedly came from Los Alamos...5 gun. I think they made tubes with more guns than that even.

I'll have a talk about this with my source. Rattle his chain a bit.

I also have an NOS PMT used in the first light-pen, the "SAGE gun" (IIRC). Just one small part of the taxpayers' money used to build the SAGE early-warning system.

Another hamfest bargain was a TEK 565 dual-beam scope with the cart. $15~25 around 7:00 AM. Oh wait, I actually remember telling that story before. Heh.

Terry Bowman, KA4HJH
"The Mac Doctor"

"I've seen things you people wouldn't believe: attack ships on fire off the shoulder of Orion... beams...in the dark in the Tannhauser Gate. All those moments will be lost in time...like tears in the rain." — Roy Batty, Blade Runner

[Charles MacDonald]

On 2020-02-12 4:49 p.m., Mac Doktor wrote:

> While we're on the subject, I have a five beam CRT that I snagged on
> ebay a few years ago. The auction listed the part number as "JAN CGV
> 7YP2" but the number on the box is "JAN CDU 7YP2" and the date is
> "195"-something.

CDU is Dumont.

> I'm told came from a Navy radar system and that it's the only one ever
> made with more than four beams. It would be interesting to hook that
> baby up to five different gadgets at the same time. 8D

well Dumont registered that one as P1, 2, 7, or 11. and two years later
as a P4.

if you want to wire it up, there are quite a few pins to connect.

[Charles MacDonald]

On 2020-02-12 5:12 p.m., Nicholas Stock wrote:
> I bought a similar one that allegedly came from Los Alamos...5 gun. I
> think they made tubes with more guns than that even.

I know Sylvania made ones with two screens. change the final anode
voltage and the colour changes! believe that those were Military only
specials.

[John Rehwinkel]

OMG that purple tube is awesome. Anybody got any for sale ?

The P11 phosphor is more blue in person.  If you want purple, P16 is a logical choice.

There are some 5ZP16 in the wild (magnetic deflection, though):

https://www.atneagoods.com/index.php?main_page=product_info&products_id=117248

Apparently the same one:

https://www.vadiyeshop.com/index.php?main_page=product_info&products_id=677847

There were some on eBay cheap a couple of weeks ago:

https://www.ebay.com/itm/202471223251

- John