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Adcom GFP-750 preamplifier , balance design

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Adcom GFP-750 preamplifier , balance design Empty Adcom GFP-750 preamplifier , balance design

Post by cutehf Thu May 26, 2022 7:20 pm

Description: Solid-state, remote-control preamplifier switchable to passive attenuator/switcher


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 (footnote 2). 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."



Condition 7.5/10
RM 4K
+6597493656 Pos to you location.

cutehf
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Number of posts : 227
Age : 49
Location : Perlis
Registration date : 2010-04-18

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