I purchased this thru Audiogon in November 2010. Here's how it was listed then:
This is Jeff Korneff tube preamp that he used for testing his beautiful sounding
Korneff amplifiers. I have requested Jeff Korneff to add the mono/stereo switch to it.
As with other Jeff's preamps, there are 2 line inputs selectable from a front panel switch.
Jeff told me the circuit which he used to build this preamp, but I do not remember the details.
I've enjoyed this very much, it's quiet, no pops etc
Time to clear out some gear, make me an offer