All the information you can find is on some italian forums unfortunately, actually when i said it's from a small manufacturer it was an overstatement, it's not available from any shop but you have to contact the builder directly;
The model i have it's based on ECC82 and 12AT7 with transformer coupled output, is fitted with an alps pot and toroidal transformer, power section is on printed circuit board, signal path is point-to-point wired, he also manufactures an OTL variant for higher impedance cans.
The manufacturer's website is www.tpaudio.it, don't know if he is open to international transactions.