AES/Cary DJH Preamp tube change

I have not tried the Electo Harmonix, though, I have not heard good things about them.

I've tried KenRad VT231's, RCA red-base, and CBS-Hytrons. Each sound quite different, and I'd recommend trying several of these versions to discover the flavor of sound you enjoy the most. Either way, they will be a huge improvement over the stock tubes (I only use the stock tubes to burn in interconnects).

Also, if you have the DJH version, you'll want to roll the rectifier tube. EZ81's are the way to go.

I realize this is not a lot of help, but it's the most honest response; there is no 'best' tube for this preamp. Instead, it's a matter of what your personal tastes are, and what tube is the best vehicle to deliver that sound.

abb,

KenRad deserves their reputation for being bass rich. They also deserve their reputation as being microphonic.

RCA is sweet & airy.

CBS Hytron is quick and uncolored (for a tube).

The EZ81 I have is a Haltron.

FWIW, I plan on cycling through most of the NOS tubes out there. Still on my list are the various Sylvanias, Mullard, TungSol, etc.

Like it or not, with this preamp and revealing down stream equipment, you'll find the tube drives much of the sound you hear; so it makes sense to look at tube rolling as a long-term ride.

Enjoy!