Type Solid-state preamplifier
Frequency response 20Hz to 20kHz
Total harmonic distortion 0.017%
Input sensitivity 365mV (line)
Signal to noise ratio 102dB (line)
Output 1V (Pre out)
Dimensions 17"W x 4.25"H x 12"D
Weight 15 lbs.
The GFP-750 is a Nelson Pass design—essentially a variation on the Pass Labs Aleph P and Pass's DIY project, The Son of the Bride of Zen. The circuit couldn't be simpler. Says Pass, "It's a differential pair—the end. A single gain stage, balanced input, balanced output, no feedback....We took a pair of MOSFETs, and the inputs go to the gates of the MOSFETs. The MOSFET sources are tied together and biased with a current source, with the signal taken off the drains. [The circuit] can run unbalanced on either side, although the performance is best when it's run balanced."
Stereophile, Mar '99