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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 14th Jul 2011, 8:03 pm   #1
Panrock
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Default Glass type used in CRM121

As per the title really. I presume the Mazda CRM121/3 tubes were made of hard glass. But does anyone have more detailed information about the type or spec. of glass used?

Thank you.

Steve
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Old 14th Jul 2011, 8:24 pm   #2
murphyv310
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Default Re: Glass type used in CRM121

Pyrex is a hard glass many EMI crts used this type of glass. The glass used in Mullard & Mazda tubes and many others is a soft glass.
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Old 14th Jul 2011, 8:37 pm   #3
Panrock
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Default Re: Glass type used in CRM121

Thanks for clearing that point up Trevor!

What would be great to know would be a ballpark COE (coefficient of expansion) figure on the sort of glass that's used on these Mazda tubes. A lot to ask I know - but this board has come up with wonders before!
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Old 14th Jul 2011, 8:42 pm   #4
ppppenguin
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Default Re: Glass type used in CRM121

GIYF There's a table about halfway down this page. http://www.oldham-optical.co.uk/Glass.htm I would assume that "plate glass" is an ordinary soft glass. Also here: http://www.warmglass.com/COESummary.htm
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Old 14th Jul 2011, 9:02 pm   #5
Peter.N.
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Default Re: Glass type used in CRM121

Thet were initially dreadful tubes many failing within the first 12 months.

Peter
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