hi, i went on google to try and find out a little about the non-magnetic parts your talking about. what i found is a good direction but no real answer to your question. the parts in the back of the tube make up whats called an inline electron gun. the gun is made of heat deflecting material but thats all they say! i went onto madehow.com and used the search terms what material is a inline electron gun made of, and searched from there. i hope this helps and please share what you find. ill look more into it my self as ive wondered what they are my self thanks for the challange questions like this need to be asked so we all can be a little better at our jobs.
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