Ah yes, tube rolling is so expensive. But it'll get worse. You will soon realize you can actually buy 12au7 to 6SN7 tube adapters and once you start down that path, you will realize the inferiority of 12au7 tubes, change amps and want the super expensive 6sn7 like the Tungsol round plates. Achieve tube nirvana you will.
Ok, that's what happened to me but it can happen to you too:)
Ok, that's what happened to me but it can happen to you too:)