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CV10917 CRT on Ebay.

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Till Eulenspiegel
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There is an Ebay seller offering a round screen 9" CRT type CV10917. This ex-MOD tube was possibly made by Brimar and the equivalent might be type F21-12LC. Another Ebay seller is offering an F21-10LD, another 9" round CRT.
The first letter must indicate the phosphor, but I can't anything about "F" phosphor.

Any ideas. Is it a dual phosphor?

Till Eulenspiegel.

 
Posted : 07/12/2014 7:21 pm
Till Eulenspiegel
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Correction: Assuming that F21-12LC is a Pro-Electron code then the first letter indicates the type of CRT, A is electrostatic focus and magnetic deflection and M is magnetic focus and deflection. So the letter F must indicate something quite different. The letters LC will be the phosphor type.

Till Eulenspiegel.

 
Posted : 07/12/2014 7:34 pm
Till Eulenspiegel
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More searching. Read about Pro-Electron CRT codes here: http://www.bvws.org.uk/405alive/tech/valvenos3.html

Looks like these nine inch CRTs are not suitable for TV use. D indicates scope tube and the letter L a storage tube. But what is C?

From ebay: http://www.ebay.co.uk/itm/231250627422? ... EBIDX%3AIT

Till Eulenspiegel.

 
Posted : 07/12/2014 7:47 pm
Anonymous
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There's a list of CRT phosphors here:

http://www.bunkerofdoom.com/tubes/crt/crt_phosphor_research.pdf

If that's correct a LC phosphor is yellow-orange very long persistence for radar CRT use. Not sure what a 'F' type electron gun would be but it's not electrostatic deflection with a neck that thin.

 
Posted : 07/12/2014 8:13 pm
Till Eulenspiegel
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I'd reckon the CV10917 has a 35mm neck. Totally useless for TV work. However, it might possible later on to have it re-phosphored as a substitute for the 9" Emiscope type 6/5, the CRT employed in the HMV 902 and Marconi 701. From the Early Television Foundation. The re-phosphor of a 40 degree deflection angle Brimar radar CRT to serve as a substitute for the RCA 12AP4.
http://www.earlytelevision.org/12ap4_substitute.html

In some respects the 12AP4 is similar to the Emiscope type 6/6 in as much it has magnetic deflection and electrostatic focus. Physical dimensions are similar although the 6/6 has a thicker neck.

Till Eulenspiegel.

 
Posted : 07/12/2014 9:22 pm
Till Eulenspiegel
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I'd reckon the CV10917 has a 35mm neck. Totally useless for TV work because of the screen phosphor. However, it might possible later on to have it re-phosphored as a substitute for the 9" Emiscope type 6/5, the CRT employed in the HMV 902 and Marconi 701. From the Early Television Foundation. The re-phosphor of a 40 degree deflection angle Brimar radar CRT to serve as a substitute for the RCA 12AP4.
http://www.earlytelevision.org/12ap4_substitute.html

In some respects the 12AP4 is similar to the Emiscope type 6/6 in as much it has magnetic deflection and electrostatic focus. Physical dimensions are similar although the 6/6 has a thicker neck.

Till Eulenspiegel.

 
Posted : 07/12/2014 9:22 pm
peterscott
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I suspect the bulbous taper wouldn't fit in the EMI tube cradle though.

Peter

www.nostalgiatech.co.uk

 
Posted : 08/12/2014 12:38 pm
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