Condition: Item is in very good condition.
The ADCOM GFA-555 II is among the world's greatest audio power amplifiers of all time.
It was designed by the legendary Nelson Pass (interview, chat room), whose amplifiers today sell new for five figure price tags.for high-end amplification. Its performance is exemplary; I haven't heard any other amplifier surpass it today.
While only rated for 200 watts per channel into 8 Ω,
this 20-year old veteran easily put out 260 watts from each channel simultaneously at only 0.007% THD into 8 Ω.
If a Japanese brand was marketing this, they'd rate it as 350W per channel into 6 Ω at 0.7% THD, or call it a "700 W amplifier."
ADCOM actually rates it as able to drive 2 Ω loads, and rates it for 850 watts at 0.09% THD into 4 ohms in bridged mono! I'm sure the Japanese could inflate this to over a kilowatt.
Measured with tone bursts, it easily put out an undistorted 370 watts per channel into 8 Ω.
ADCOM GFA-555 II.
Two gold-plated, Teflon-insulted brass RCA jacks.
They are close enough together to make connection a breeze.
1.75V for 200 W into 8 Ω.
130 mV for 1 W into 8 Ω.
Rated Power Output
200 watts per channel into 8 Ω from 20 - 20,000 Hz at less than 0.04% THD, both channels driven.
325 watts per channel into 4 Ω from 20 - 20,000 Hz at less than 0.04% THD, both channels driven (requires fan option to do this for any length of time).
600 watts into 8 Ω from 20 - 20,000 Hz at less than 0.04% THD, bridged mono (requires fan option to do this for any length of time).
850 watts into 4 Ω from 20 - 20,000 Hz at less than 0.09% THD, bridged mono (requires fan option to do this for any length of time).
2.5 dB at 4 Ω.
1.7 - 100,000 Hz at - 3 dB.
10 - 20,000 Hz +0, -0.25 dB at 1 W RMS into 8 Ω.
Not less than 800 from 20 - 20,000 Hz into 8 Ω.
Not less than -110dB down from 200 watts into 8 Ω, A-weighted.
230 VAC 50-60 Hz.
72 VA idle.
1,500 VA maximum.
675 VA at 200 W into 8 Ω.
I measure 37.5 watts at idle, cold.
60 watts at idle, warm (0.73A).
92 Watts (1.09A) when delivering 1 watt per channel into 8 Ω.
845 watts when delivering 265 watts per channel into 8 Ω.
It draws zero power when turned off because it has a real power switch. It's not like modern equipment that never really turns off and consumes power and remains a fire hazard any time its plugged in. The GFA-555 II is completely disconnected when switched off.
Chassis: 6-3/4 x 17 x 12-3/16 inches (172 x 432 x 310 mm) HWD.
Overall: 7-1/4 x 17 x 12-3/16 inches (185 x 432 x 310 mm) HWD.
35 pounds (16 kg).
39 pounds (18 kg), packed.
Made in USA.
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Last edited by raymond88 on Mon Sep 09, 2019 9:32 pm; edited 1 time in total