NOS tubes for Aesthetix Calypso

You want Mullards. When I owned the Calypso I found them to be very smooth.
Steve

I have the same preamp. I’m very pleased with it. I’m also looking for tube replacements for both the 6922 and the 12ax7. I heard that Mullard 10M and Telefunken are fantastic tubes. I wonder where to buy these tubes.

Mullard 10's will cost you a fortune. Read the threads by Perfectionist. He recommends a few since he did a great deal of tube rolling. Also the great Jadem6 wrote a fabulous review and also identified so good tube to use with this pre-amp.
I just got mine and have Siemens 6922's and Dynaco 12ax7's. However, I expect to do some tube rolling. Why? Because I still have my Audio research LS 25 MKl and this per-amp is giving this new Calypso a real RUN FOR THE MONEY!!!!
Rick (RWD)

I have replaced the standard 6922 Reflector tubes with a Russian Reflector 6H23P-EB, witch results in greater dynamics and “swing”, But a bit more edgy style… USD 22.5 at Parts connexion.

I have also replaced the standard 12ax7 with a new production of Tungsol ECC803S Gold Pin, witch results in deeper soundstage. USD 29.95 at Parts connexion.

I am still seeking for a more lucid and full born sound.

I am currently using the Calypso. I have done some tube swapping, and have currently settled on the Mullard 10M 12ax7 gold pin and the Amperex 6922 PQ white label. I have found this combination very musical, although I admit to being influenced by all of the 'tube lore' floating around out there. Unfortunatly, these tubes are hard to come by. I was using the Mullard M8137 (for the 12ax7 slot) prior to the 10M, and I must say it was also excellent. Those are easier to come by, and much less expensive. I haven't AB'd them in a while, but I don't believe there is a huge difference. Also, long plate Mullards should be good.

Of course, it is a matter of personal taste, system synergy, and the quality of the actual tubes that will ultimately tell which is best for your system.

John.