Impact of Calypso 6922 tubes?
I am trying an Aesthetix Calypso preamp. This is a newer unit with no noise floor issues whatsoever, and the stock tubes are very quiet. I tried replacing the stock 12AX7's with a nice pair of NOS Brimar tubes I had sitting around and heard noticably more body and a richer tonal presentation. To those of you who have this preamp, have you noticed similar changes when using NOS tubes, and would I be likely to hear similar changes if I were to replace the 6922 output tubes with NOS?