The lamps most commonly associated with it are the famous Electro Harmonix, however I tested also with Svetlana ("Winged C" made in St Petersburg) and that's fine too. The amp is accurate and spatialization is very good. His only fault may be low at times a bit dry (though as usual it depends on which other elements it is associated so be sure this perspective) and some "slowness" of the famous tube amps (it seems it also called "transients"). Anyway I highly recommend this amp gives me many hours of daily listening and admiring.
This amp is no longer manufactured, however, you will have to patience to fall on the opportunity of the moment! In my case it is associated with the speakers Triangle Celius 202 I also recommend.
PS: FYI: The average new price is (was, rather) of 2300 euros and 2000 euros argus about.