Pedrillo, Just a note on Calypso preamp tube compliment, I'm currently running a pair of RCA 5751 black plate triple mica and a pair of Telefunken 6DJ8. The 5751 have a little less gain (3db?) than the 12AX7 (I've run lots of old stock 12AX7s) but much quieter, they have a huge midrange with nothing lacking at either end, and the preamp has plenty of gain. Could not be happier.
Happy Listening!
Happy Listening!