H19 Tube color information

[Scott Miskiv]

I’m in the process of diagnosing and have identified a bad Tantalum capacitor and another that is failing on a H19 I purchased recently and am still checking it out fully. I’ll probably replace them all. Anyway I am hoping I have a model with a green phosphorus tube but I have no way to know yet. Is there any telltale way to check, short of powering it up?  I’m not there yet. Hoping that maybe the manufacturer put some sort of label or part number on it somewhere.

Thanks,

Scott

[Glenn Roberts]

I’m told this is not necessarily a reliable way, but in my case all the green phosphor CRTs have a matte finish to the glass. The shiny glass CRTs are white phosphor. The definitive way is to look for the manufacturer and model number. There should be a label on the CRT. I’m not aware of a listing of manufacturers and parts used in the h19, but there are enough of us on the list that hopefully we can decipher the numbers.

be able to decipher the 

Sent from my iPad

On Nov 28, 2024, at 2:33 AM, Scott Miskiv <scott....@gmail.com> wrote:

I’m in the process of diagnosing and have identified a bad Tantalum capacitor and another that is failing on a H19 I purchased recently and am still checking it out fully. I’ll probably replace them all. Anyway I am hoping I have a model with a green phosphorus tube but I have no way to know yet. Is there any telltale way to check, short of powering it up?  I’m not there yet. Hoping that maybe the manufacturer put some sort of label or part number on it somewhere.

Thanks,

Scott

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[Terry Gulczynski]

Scott & Glen,

My H89A Operation Manual Parts list shows the following:

411-838 - White standard CRT (glossy finish)
411-851 - White anti-glare (matte finish)
411-852 - Green anti glare (matte finish)

So... If it's glossy, it's white. Matte (etched) finish can be either
white or green.

(My manual is from a 1982 build; if there there were more CRT types
after that then I dunno about it.)

If necessary, I can open glossy white and matte green machines to check
for any model/part # info that might be present on the CRTs. I do not
have a matte white machine, so no help there.

Regards,

Terry

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[glenn.f...@gmail.com]

I have one H19 that was easily accessed. It’s a green phosphor with matte finish. Here’s the label on the CRT. Note Heath part number: 411-852, which concurs with Terry’s list as a green phosphor matte finish CRT….  I think 0983 is a date code (?) which would mean early March of 1983. It’s an H19A so a later model. In 1983 kits were $625 for green version:

Heathkit Catalog 860-0Cover.jpg

 

• Glenn

 

 

 

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[Scott Miskiv]

Thank you Glenn and Terry for responding so quickly with such good information!  I was able to get my iPhone under the monitor and take a picture of the label. I didn’t really find anything out about it yet though on the internet. The screen seems glossy to me so assuming white. 

—Scott

[glenn.f...@gmail.com]

I was able to open another H19 and it has a Toshiba tube with the same markings. It’s a white phosphor so I believe you’re correct.  The glass will be quite shiny – like normal glass. You should see your reflection.

 

Oddly the CRT was installed with the label on the bottom, so not visible. Sounds like yours was too?  Since these were kits I presume it was up to the builder to decide which way to orient the tube? I used your trick with my phone to take a pic.  Tx!

 

 

From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Scott Miskiv
Sent: Thursday, November 28, 2024 9:38 AM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] H19 Tube color information

 

Thank you Glenn and Terry for responding so quickly with such good information!  I was able to get my iPhone under the monitor and take a picture of the label. I didn’t really find anything out about it yet though on the internet. The screen seems glossy to me so assuming white. 

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[Royce Taft]

If you pick up a cheap UV led flashlight, and shine it onto the CRT phosphor, the phosphor will glow quite green compared to white, amber, or color CRT phosphors. 

I can’t recall if attachments are permitted, so here’s a link to a photo hosting site with some images of various CRT phosphors lit with a UV flashlight for example. 

The effect is much more pronounced in person than in these photos. 

It really helps if you can go between shining on a white phosphor and a suspected green phosphor quickly so your eyes have something to compare against. 

Royce

Sent from my iPhone

On Nov 28, 2024, at 05:50, glenn.f...@gmail.com wrote:



I have one H19 that was easily accessed. It’s a green phosphor with matte finish. Here’s the label on the CRT. Note Heath part number: 411-852, which concurs with Terry’s list as a green phosphor matte finish CRT….  I think 0983 is a date code (?) which would mean early March of 1983. It’s an H19A so a later model. In 1983 kits were $625 for green version:

Heathkit Catalog 860-0Cover.jpg

 

• Glenn

 

 

 

<image001.png>

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[Scott Miskiv]

Hi Glenn,

Yes same for me.  Thanks for confirming it’s a white phosphorus tube.  

[Scott Miskiv]

Thanks for the UV tip Royce. I hadn’t even considered that approach. I’ll have to try that!

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[G. Beat]

Clinton Electronics was founded at Loves Park, IL (north of Rockford) in 1963 , as a CRT manufacturer (B&W)..

Thru the years the expanded into importation from South Korea and Taiwan for modules & assemblies.

https://www.clintonelectronics.com/products/monitors/5in-13in-monitors/ce-mm9/

They are still in business today, having migrated to the CCTV industry as a primary market, with the migration from CRT to LCD.

==

Industrial Panels in Eau Claire, WI also provides LCD replacements for CRTs

for industrial machines. Not necessarily cheap.

https://www.industrial-panels.com/CRT-replacement-monitors

greg

[Joseph Travis]

Scott,

For H19s  / H89s, one way to tell the difference is the face of the CRT.  A white CRT will have a "gloss" face while a green CRT will have a "matte" face.

BR,
Joe

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