Just ordered my Supratek Chenin Preamp

Mcintosh 352, B&W802N, Cabernet. Sonic heaven.

IMHExperience EH6sn7 was equally no so good like stock Sovtek,
KenRad VT231 had much better harmonics, bass bloomy somehow, but match clearer picture then with EH or Sovtek,
Huge improvement was Sylvania 6sn7w metal base chrome top,
equally good was Mullard CV2821.
I have tried NU Grey glass to very good (similar to KR) more body them with Sylvania but less detail.
So it depends what do one prefer body or details what room you have what amp?
I have Clayton M100 which is pretty dark so I need tubes with details.
I'm using Bendix6106 as rectifier and EH as regulator, GEC KT66 was perfect in my previous 400sq feet room in current room 190 sq feet I'm using EH tubes with GEC KT66 too much bass.
Regards to all.

Marantz SA-14 Ver2, Chardonnay, Perreaux E220, Hyperion 938.

Cat JL-2, Martin Logan Summit.

My Syrah is almost seven years now. The longest I have ever had an audio component! 8 or 9 poweramps have come and gone, the Syrah remains.

Tube rolling is tricky. I have tried 6F6, 350B and NOS 6L6 regulators and 6106, 5V4 and GZ37 rectifiers but right now I am listening to the stock sovtek 5881 and philips 5Z4 and prefer them! The bass is better with the 6F6 and 350B, but smoother and warmer with the stock tubes.

Favourite 6SN7 is Hytron JAN-CHY, but I will try the EH 6SN7 soon

I have the Supratek Sauvignon preamp. I currently am using a Mullard GZ34 as the rectifer tube. Does anyone know if I can substitute a 5Y3GT for the GZ34. Also, is the 5Y3GT the same tube as the 6106? I like the sound of this preamp with RCA 6L6GC's used as the regulators. To me the RCA 6L6GC's sound better than the Genelax KT66's.