hi all, I just received an older version (no feedback control). I'm curious about tube rolling and if there are any particular tubes I should avoid specifically; for example I've read 6Y6 output tubes run hot. There was also an update where the 6X4 was replaced with an EZ81 or 6CA4. Does that model have any advantage or disadvantages with tubes?
Just hoping to make sure I don't create any autoimmune disorders within its design.