Avid - Pro Tools 12.2 Plug-In Guide - Barry Rudolph

Here's a shot of a frequency sweep of one of it's outputs...

ART Power Plant preamp - JVM Forum

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Moosers's review - Bomb Factory SANSAMP PSA-1 -

Today I got an old ART Power Plant preamp from the late '80s or early '90s.

Tech 21 Sansamp TRI-AC Review - Houston Music

Looking at it, my guess is it's been in a pawn shop or music shop for quite a while (judging by the price sticker glue imprint that's steadfast to it).

Sansamp psa1 1 manual:

Rating: 97 / 100

Overall: 87 Rates