try tube asylum....or tube diy asylum. Might also call the Atmasphere folks I think they use these tubes.
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There was a site with links covering this exact subject. For some reason the server is down or the web site has been removed.
The link provided below is only in "cache" with Google. If you find value in the comparisons I would print it out before they remove it. Hopefully the original will return with data intact.
Ask Kara Chafee. She repairs hickock testers and with an email address of [email protected] should be able to give a definitive answer! That said, I think its more important to have the two triode sections in an individual tube to be closely matched than the absolute values.