TC1

[Mike K5MLC]

HI Fellow Heathens,

Hope all are well.   I have a working specimen of the TC1 tube checker/
fairly clean for its age.  The internal roll chart works well.  My question
relates to tubes that came on the scene after the chart was published (195?).
 I'm thinking there outta be some addendums to the chart (equivalency??) to
allow me to check some of the newer tubes.   Maybe a tube substitution chart
or sumpthin'.

Thanks in advance for any help/ideas.

Mike, K5MLC

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