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 Post subject: jan-gc-7bp7 and gl-7bp7
PostPosted: Mar Wed 14, 2018 11:13 pm 
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Joined: Apr Wed 20, 2011 3:38 pm
Posts: 26
Hi, I have two old CRTs here but I can't find much about it.
They are jan-gc-7bp7 and gl-7bp7. Are these like radar tubes
green and long persistence? Or any good for TV?

Thanks in advance for your info!

Regards, Roland


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 Post subject: Re: jan-gc-7bp7 and gl-7bp7
PostPosted: Mar Wed 14, 2018 11:54 pm 
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Joined: May Sun 07, 2017 11:35 am
Posts: 591
Location: Belrose, NSW, Australia
Well, here's what a P7 phosphor behaves like:

https://www.youtube.com/watch?v=hZumwXS4fJo

Decide for yourself if this would drive you nuts trying to watch TV!

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 Post subject: Re: jan-gc-7bp7 and gl-7bp7
PostPosted: Mar Thu 15, 2018 12:09 am 
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Joined: Apr Wed 20, 2011 3:38 pm
Posts: 26
If both tubes are P7 phosphor then I would go crazy I think...
But I could not find what kind of phosphor is used in these tubes. So that is P7 for both?


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 Post subject: Re: jan-gc-7bp7 and gl-7bp7
PostPosted: Mar Thu 15, 2018 12:30 am 
Member

Joined: May Sun 07, 2017 11:35 am
Posts: 591
Location: Belrose, NSW, Australia
That's what the P7 on the end of the type number means.

Examples that I know about:

P1 = short persistence green
P4 = short persistence blue/white
P7 = long persistence white - green (radar tube)
P22 = color.

I seem to recall the ETF had some radar tubes re-screened before RACS (the world's last CRT rebuilder) closed down.

_________________
Wax, paper, bitumen, cotton, high voltages - what could possibly go wrong?


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 Post subject: Re: jan-gc-7bp7 and gl-7bp7
PostPosted: Mar Sat 17, 2018 11:54 am 
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Joined: Apr Wed 20, 2011 3:38 pm
Posts: 26
Ah thanks, I didn't know that. But now that you say it,
this makes sense for all other US tubes which I have :-)


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