David bought your modules about 4/5 years ago at the time had a lot of tube amps with volume control so didn't us it much, recently bought Nelson Pass's Amp Camp Amps and needed a pre to go with them . this may be a perfect match , and don't feel the need to go back to my tube amps which I'm so fond of. very impressed with this combo on my single driver speakers. thanks so much . the word will be spread!!!