I built an EL34 SET (triode mode) amp using the 3K primary One Electrons several years ago. Sounds great, even got compliments at the NNETG ' fest over at Gary Kaufman's place back in June 2005.
The circuit was a basic "ripoff" of Claudio Bonavolta's "EL34SE #3" circuit, but with SS rectification rather than tube rect. Pretty much basic SET and VA circuitry, no fancy tricks or techniques...
As I didn't fully grasp the finer subtleties of single point / star grounding, it has a wee bit of background hum, but only audible with very high efficiengty speakers during quiet passages or between tracks.
I'd rate them a "Five THumbs Up"...
IIRC, the 1Es come with 1.6K, 3K and 4.8K primaries, no UL taps, and they also have two different plate load chokes, and big honkin' hefty power "universal" transformers. AFAIK, the only seller for 1E is AES
www.tubesandmore.com
/ed B