any clues? on mystery TOOBS...


I found a Quad of Tubes! no markings other than 6H1C ? no brand name on them? diamond logo, or stamp w/the #30
inside of it...or the other marking is a big circle with the (6H1C) inside of it. So can you help a brother out, and tell me what these are?
thanks in advance
Craig
mang53
I did find a 6H1 tube. See http://www.mif.pg.gda.pl/cgi-bin/vs4.pl
thanks, but it comes up BLANK?
Most likely Russian origin. They a have a different code number than Western tubes.