I presently own a PV-1 thats been factory upgraded to PV2a that is absolutely wonderful. I have used it with both tube and ss power amps. I had an associate that told me that it was broken when i let him borrow it in an attempt to buy it from me lol. I have used it with Bottlehead Paramours Carver M400 Cubes B&K and Adcom with great results driving everything from Bozaks to Tektons to Zu Omens.While i realize this is an old post i felt my comment is relevant being that i own and use this preamp daily. I wouldnt consider selling it for less than $750
