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-   -   Glass type used in CRM121 (https://www.vintage-radio.net/forum/showthread.php?t=71820)

Panrock 14th Jul 2011 9:03 pm

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

murphyv310 14th Jul 2011 9:24 pm

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.

Panrock 14th Jul 2011 9:37 pm

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! ;)

ppppenguin 14th Jul 2011 9:42 pm

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

Peter.N. 14th Jul 2011 10:02 pm

Re: Glass type used in CRM121
 
Thet were initially dreadful tubes many failing within the first 12 months.

Peter


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