1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
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Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
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Rediffusion CITAC (MK4A)
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Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
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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
Suggestions
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Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
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
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
B&W TV Ion Trap query

Now we've all been told that an incorrectly adjusted ion trap in a bent gun tube can cause damage.
What I would like to know is the mechanism by which this damage occurs. What is the symptom? Is the CRT emission harmed after being run with an incorrectly set trap? How does the damage occur? Too many ions hitting the phosphor?
I'm struggling to picture what would happen.
Over to you ...

Ion traps are a bit before my time so I may be wrong but as i understand it you set them for maximum brightness. Otherwise not all of the electron beam is hitting the Phosphor and as a consequence the tube is being run harder thereby shortening it's life.
Same as the tubes were alleged not to last as long in sets like the KB deep scene where there was a tinted screen in front of the tube meaning the viewer turned the brightness up.

There are two different types of ion trap. With the bent gun type I don't think there would be any damage due to wrong adjustment of the magnet as the ion stream will still be aimed off screen. The other type has a straight gun but with a diagonal slot between anodes so a maladjusted magnet could cause the ions to hit the screen.
Peter

Nice write up with photos of the damage to the electron gun assembly in Radio and Electronics, April 1955 page 64.
https://worldradiohistory.com/Archive-Radio-Electronics/50s/1955/Radio-Electronics-1955-04.pdf
Frank

Posted by: @nuvistorNice write up with photos of the damage to the electron gun assembly in Radio and Electronics, April 1955 page 64.
https://worldradiohistory.com/Archive-Radio-Electronics/50s/1955/Radio-Electronics-1955-04.pdf
Thanks Frank, perfect !

That is good, I’ve always wondered how exactly it should be set up. I haven’t encountered a tube with the glow in the neck when setting it up, sounds a useful feature though!
Regards,
Lloyd
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