6SN7 driver tubes

Ditto recommendation of Tung Sol 6SN7 reissue. They get pretty close to the good characteristics of NOS Russian 1578.

I have always used EH 6SN7 tubesin all my Cary amps and preamps w/ excellent results for not much doe. They are nicely balance and great frequency extension. They last a really long time, as I've never had one go bad. They do take a long time to break in before they really sound fluid.

I just looked at your system and see you are using the DJH preamp. I had that premp and the Chinese tubes Cary used sound really musical, smooth, and big (but with a diffused soundstage). The EH in the place of the Chinese had much better detail and frequency extension. They will sound a bit harsh until they break in.

With this preamp you never have to, or never should turn it off. It will sound better and the tubes last forever in it. This is Cary's recommendation, not my own, and my experience confirms this.

I appreciate all the feedback and suggestions. Thank you!