Need Help Choosing a Tube Preamp for a Classe Amp

I have a Calypso. They ship it set to the highest gain setting which is to high for most systems. That's why there are reports of tube rush. To change the gain setting you just have to move some jumpers inside. Also the stock tubes tend to go noisy pretty quick unless you get lucky and receive a good set. I Switched to NOS and haven't had any problems at all. I've had these for almost 3 years. I listen for about 2 to 3 hours a day. So that's at least 2,100 hours and counting. I recently bought a new set to have a back up. I put these in and there wasn't much difference in the sound so I put the old ones back in.

Not sure if it's the right fit for your system but it definitely is worth a listen.

The info on the Calypso if very helpful. Thanks.
If you don't mind me asking, how pricey are the NOS tubes and how challenging is moving the jumpers?

How about the First Sound Presence or Wyetech Opal? Is a phono stage a necessity?

The top of the Calypso is held in place with Velcro, for easy access, replacing the tubes and changing the gain setting are simple. Amperex 6922 PQ are $200 a set or Mullard 6922's are $280 a set and Mullard CV 4004 are $180 a set.

For many years the "synergistic" combo was Audio Reasearch pre, Classe amp, Thiel speakers and all MIT cabling. I have followed this guide line with great success with Thiel 2 2s and 5is. Pre's were LS15 and Ref1. Amps CA100 and CA400. Cabling MIT 350 Ref and 850 Ref.