I have a Heintz and Kaufman 5998 tube, and I read that the Tung Sol 5998 is overall the "best" tube for the Bottlehead Crack w/speedball.
Also, are the 5998 tubes from Heintz and Kaufman and Tung Sol essentially the same tube, or does the different manufacturers mean that there may be some sound differences?
I don't see much info on the Heintz and Kaufman 5998 tube (with a quick google search), so I would like to know what's the general consensus on them.