In post 10
Quote:
Originally Posted by Heatercathodeshort
The Z gun was in fact the later gun from the 110 degree tubes with the B8A base. It was used to replace the obsolete gun in mainly Mullard tubes such as the MW43-64/69, AW43-80 etc and late production replacement new tubes,
It was supplied with a small mod sheet. I don't think it was the type of phosphor that had anything to do with ion burn proofing. I think manufacturers liked the idea of an 'ion trap' in the sales literature as the public were very aware of problems with their first generation TV receivers screen becoming stained, even if it was not needed in aluminised tubes. J.
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So this suggests a reason why some aluminised tube may still have an ion trap. I wonder if there is also a case of using up older assemblies in tubes that had the aluminised back coating on the phosphor.
It was this coating as far as I understood that stopped the requirement for the Ion trap, I am sure I have read this as such somewhere. Is this correct?
Adrian