Can someone tell me about this tube? 6C19N-B

I am helping a friend sell off a large collection of tubes and I have a case of 6C19N-B tubes. Not sure how to market them for sale.

Thanks

ltd71011-12-2012 7:21pm

Post removed Aug 05, 2015
ltd710 OP Details Discussions Posts This discussion Message User 1 posts 11-15-2012 at 02:00pm Copy Comment URL Report Comment Edit Delete Thank you for the reply,this is helpful. Thanks,
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