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Music centre modifications
Unusual record player modification
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Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
CV10917 CRT on Ebay.
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.
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.
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.
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.
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.
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.
I suspect the bulbous taper wouldn't fit in the EMI tube cradle though.
Peter
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