Adcom GFA 555 MK2 Power Amplifier @ 200W per channel

Item: Adcom GFA 555 MK2 Power Amplifier @ 200W per channel

Condition: Item is in very good working condition

Price: RM1900 or swap/topup

Contact: 012-3816611










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.
 
Inputs
100k Ω.
Two gold-plated, Teflon-insulted brass RCA jacks.
They are close enough together to make connection a breeze.
 
Gain
27 dB.
 
Input Sensitivity
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).
 
Dynamic Headroom
2.5 dB at 4 Ω.
 
Power Bandwidth
1.7 - 100,000 Hz at - 3 dB.
 
Frequency Response
10 - 20,000 Hz +0, -0.25 dB at 1 W RMS into 8 Ω.
 
Damping Factor
Not less than 800 from 20 - 20,000 Hz into 8 Ω.
 
Noise
Not less than -110dB down from 200 watts into 8 Ω, A-weighted.
 
Power Input
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.
 
Size
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.
 
Weight
35 pounds (16 kg).
39 pounds (18 kg), packed.
 
Quality
Made in USA.



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