Adcom GFA-545 II
Documentation on the GFA-545 II is thin. What survives comes mostly from period advertising and a few magazine mentions. The model was an evolution of Adcom's original GFA-545, an amplifier that had already earned a reputation for substantial power, clean sound, and reasonable cost. Audio (May 1991, p.22) said the new "II" version let Adcom "refine and balance the details you can hear" and, drawing on experience with the thousands of GFA-545s already in service, "build for optimum reliability."
The output stage ran from a generously sized power supply. Audio (October 1991, p.102) called it "massive." The same source outlined the protection scheme. If the amp was pushed into overload, front-panel LEDs indicated the condition and the amplifier shut down temporarily. Once it cooled to a safe operating temperature, it came back online on its own. A truncated specifications box in that same issue rated the continuous output per FTC requirements from 20 Hz to 20 kHz at <0.04% THD into 8 ohms. The precise wattage figure is not legible in surviving scans.
Beyond those fragments, little else is formally recorded. No service manual, schematic, or detailed spec sheet appears to have circulated widely.
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