Guys, I found NOS 6CC1 Tesla's and they look just like any general 6SN7 tube, but need to be sure if they can be used as DIRECT replacement of 6SN7 type. Also look for data sheet of them, cant find a single thing so far.
There is a great program for tube substitutions called Duncan's Amp Tools. It's a free download. Do a search. You should be able to find it without too much trouble. The program shows you all the variants to each tube type. Very helpful.
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