In article .net, "gil"
writes:

I have a NC 183D that has a couple of disconnected components also seems to
have a mod where the 6J5 used to be was modded to take a 8SN7 ???

6SN7. Which is actually two 6J5s in one glass octal envelope.

Has anyone heard about this mod?
Will appreciate any help or input, I can even email digital pictures of the
underside if that would help.

Never heard of any mods like that but it could be a product detector. Another
possibility is that a former owner had a 6SN7 but no 6J5s and rewired the tube
socket to use one side of the 6SN7

73 de Jim, N2EY