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Adcom gfa 555 2 ll ii
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15 000 kr
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Effekt forsterker fra adcom som er særdeles musikalsk
Flott forsterker med masse driv og null ulyder.
Kan høres hos meg .
Kan også være behjelpelig med leveranse rundt Oslo området da jeg er jobber rundt i området.
Introduction
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The ADCOM GFA-555 II is among the world's greatest audio power amplifiers of all time.
The GFA-555 was designed by the legendary Nelson Pass (interview, chat room), whose amplifiers today sell new for five figure price tags. The GFA-555 II was designed from the ground up, except for the heat sinks and chassis, by Walt Morrey. Considering that you can get a used GFA-555 II like this one for about $350, I doubt there's a better bargain 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.
This amplifier makes as much power as you can get from a linear audio amplifier from standard 120 VAC 15 Amp wall socket, and it runs cool and has less noise than any other power amplifier I've measured! It also makes no transformer buzz; it needs no fan and runs silently, which should be a requirement for any high-fidelity amplifier. It also has no thumps or whistles when turned on or off.
I have this lab report first, since I always run old gear through the lab to be sure it's stable and not going to blow up good speakers. More serious auditions are still to come, but from what little I've heard, it's clean, quiet, neutral and effortlessly powerful.
The clip indicators are dim at best. They start to light at 0.3% THD, they're halfway on at 1% THD and on fully at 3% THD, but if I designed this amplifier, they'd be a heck of a lot brighter and stay lit for several seconds regardless of how short the clip.
Because idle power drain is so low and the power supply uses such enormous capacitors, the GFA-555 II plays for a long time after turned off. The power LED stays on for 15 seconds if not playing anything.
Unlike most amplifiers with crappy mono bridging switches, the GFA-555 II uses a nice toggle switch that still works great after 20 years. Other amps that use slide or pushbutton switches have usually gotten dirty and gone flaky, while the GFA-555 II still sounds like new.
The GFA-555 II is state-of-the-art. It's funny to say, but the GFA-555 II much better than any of ADCOM's preamps. You're best driving this amp from a real preamp, or directly from the variable output of a CD player, skipping a preamp entirely. ADCOM's preamps are noisier than this amplifier deserves.
I have not tested today's ADCOM GFA-555SE, which appears very similar. The ADCOM GFA-555ms is a smaller model. I'm a cheapskate, so I prefer the real thing for a fraction of the price of today's recreations, but for most people, buying new is much easier.
ADCOM GFA-555 II Ad
The Adcom GFA-555 represents the most advanced thinking in audio amplifier design. At 200 +++watts per channel, it offers exceptional value and superior performance at a reasonable price.
Specifications
555
II
Power output: 200 ++ watts per channel into 8Ω (stereo), 600 watts into 8Ω (mono)
Handmade some of the amplifiers Actually delivers up to 300 w per channel.
Frequency response: 10Hz to 20kHz
Total harmonic distortion: 0.09%
Damping factor: 800
Gain: 27 dB
Input sensitivity: 1.75V
Signal to noise ratio: 110dB
Semiconductors: 42 x transistors, 2 x zener diodes, 13 x diodes, 2 x IC, 2 x diode bridges
Dimensions: 185 x 432 x 310mm
Weight: 16kg
Innbytte kan være av interesse. I prosessor / reciver med xlr fra yamaha med musiccast, eventuelt Mellomlegg .
Denne må bare høres .
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Sist endret: 10.11.2025 kl. 18:13 ・ FINN-kode: 243165787
