I just bought and installed a pair of the 1570. Mine is # 19 of 28 produced. Holly Cow. They just keep asking you to turn them up, and the higher you go, the better they sound. Don't take that wrong. They are amazing at low volume, their is just no fatigue with them. Clarity - Wow. Tonal Balance - Wow. All around the best amps I have had in my system.
Tom Tutay built a preamp for me in late 2003 in my Precision Fidelity C8 chassis as the C8 had gone south. It is a 12AX7, 12AU7, 12AT7 dual mono design with an external power supply. It is awesome and still running strong in 2016.
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