I have enjoyed my Zana Deux # 17 for over one year. I rolled the tubes, upgraded the umbilical cord, tried various power cords, and power conditioners. The final system sounds wonderful. Marantz SA11-SA1- AudioQuest Cheetah innerconnects with 144 volt DBS system, Zana Deux with Valvo or Ultron 6SL7GT driver tube, Stephan Audio Arts umbilical cord, Sennheiser 650 phones with Stephan Audio Art cord, Black Sands Violet power cord to the SACD player, and an Alan Meyer studio reference power conditioner.
I sent the whole system as above to Cryogenics International in Scottsdale, Arizona to be cryogenically treated. Turnaround time door to door was 8 days. Cost was approximately $7.00 a pound plus shipping.
This treatment has significantly improved the system and my listening pleasure. The background noise is lessened, the sound stage is much improved, note decay is better, texture of instruments is improved.
This has been a very rewarding experiment.