Conrad Johnson Premier 140 6922 tube swapping

Although a bit off topic, I would suggest you make sure that amp has the upgraded film caps in the regulated power supplies. The old polystyrene caps have issues. If one shorts, and they do trust me, it takes out the whole regulator and it's not a pretty picture or a cheap repair.

I believe the 140 can accept KT-120's.

Repuluso....That amp had issues as I stated above with the polystyrene film caps used through out that amp. The biggest problem is that fact that those caps are used in all four voltage regulators. Therefore, given the amps age, if the amp hasn't had power supply issues yet, it will. When one of the caps shorts, it takes out every single semiconductor device in that regulator which is extensive. If you or anyone is going to keep that amp and it does not have the new caps installed, have them installed. It's a lot less expensive to do it before the voltage regulators fail.