Hi, I am one of the guys that Pubul57 maybe refering to regarding the Ming DA 2A3 preamp. It replaced my CAT Ultimate and was better by a wide margin. Like any tubed gear, to get the best performance, tube rolling is necessary. I EXTENSIVELY rolled the CAT Ult and took it as far as I could with rolling and PC's, IC's. The Ming DA is in a different league. Pacificvalve.com is the sole (to my knowledge) US distributor. They offer a thirty day in home audition. You pay for the shipping and a 3% restocking fee. I think it would come to $150 to try.
The stock 2A3 Chinese tubes are not bad but the others should be rolled 6SN7 (3), 6922 (3), EL34 (1). I think the preamp costs $1250. Truly a giant killer. I still use the JL2. I wanted to buy a pair of Ming DA monoblocks but the only ones that I felt would be powerful enough to drive my Avalon Osiris were discontinued.
Bart
The stock 2A3 Chinese tubes are not bad but the others should be rolled 6SN7 (3), 6922 (3), EL34 (1). I think the preamp costs $1250. Truly a giant killer. I still use the JL2. I wanted to buy a pair of Ming DA monoblocks but the only ones that I felt would be powerful enough to drive my Avalon Osiris were discontinued.
Bart