Tube Preamp

I'm using NOS Sylvania 6SN7GTB "chrome domes" in the Freya (one pair is a Philco made by Sylvania...identical innards) and the sound is superb. They're not expensive, and I simply go with Dennis Had's recommendation of using NOS stuff if available. I have an Amperex 6SN7GTB as the driver originally supplied in my Had SE amp, and liked it enough to buy a backup...those suckers are hard to find. 

I'm a Freya/Loki owner (does that sound like an AA confession?), and wrote a little review of the Loki here when I first bought it...I'm a long time live sound engineer and musician, and consequently an irrational snob here and there who dislikes DSP (me and Steve Guttenberg it would seem) and the Loki is astonishingly transparent...no clicks or noise when engaging it, basically no impact on anything until Knob Turner arrives. And the Freya is also sort of amazing regardless of it's "so cheap it's irrelevant" cost, with more inputs and outputs including balanced than most anything out there, and 3 operating options with a remote that allows you to scroll through those options...I prefer the higher gain tubes as my little single ended tube amp needs some prodding, although it could all be a conspiracy to get me to buy a lot of 6SN7GTBs...if so it worked. Also, I can't imagine a better power supply would make the Loki work better, as it's so good as is.