You may want to check out a passive TVC. I've used the new Bent Audio TVC (with Slagle autoformers) with my Nuforce 9.02's.
Obviously being passive there is no circuitry to warm up. I just left the Nuforce amps on all the time and simply fired up (woke up from sleep mode) my iMac music server - instant tunes.
I thought (in my system) that the TVC performed well sonically. Very fast, great transparency, dynamics - everything was there. Of course, noise was non-existent. No special power cords or tuning tweeks required.
Provided you have enough gain from your front end (and reasonable efficient speakers) there is plenty of range on the volume control (Bent has 1 db increments on the volume control).
Just a thought.
Dave