Famous 200 wpc High Current Stereo Power Amplifier
All pre-owned product is tested in our service department and have been passed for sale... and comes with a 90 day warranty!
In nice condition, cabinet has some scratches - but mechanically, this works great! Original box and packing are not included, but we promise to pack carefully.
Amp w/out packing material is 36lbs.
The ADCOM GFA-555 is among the world's greatest audio power amplifiers of all time designed by Nelson Pass.
On Stereophile Magazine's Recommended Components list for many years.
Key specs include a wide frequency response (10Hz-20kHz ±0.25dB), high damping factor (>>800), and conservative ratings for reliable performance with demanding speakers
At 200 watts per channel, this solid state amp from the 80's offers exceptional value and superior performance at a reasonable price. Great for low impedance loads. The GFA-555 is of the smoothest, quietest, and nicest-performing amplifiers we have seen over the years.
Key Specifications
Power Output (Stereo): 200 Watts per channel into 8 ohms, 325W into 4 ohms (both channels driven, <0.04% THD).
Power Output (Bridged Mono): 600 Watts into 8 ohms (<0.09% THD).
Frequency Response: 10Hz–20kHz (±0.25dB) @ 1W, 8Ω.
Power Bandwidth: ~1.7Hz to 100kHz (-3dB).
Total Harmonic Distortion (THD): <0.04% at rated power (8Ω).
Damping Factor: >800 (20Hz–20kHz, 8Ω).
Input Sensitivity: ~1.75V rms for 200W into 8Ω.
Gain: ~27 dB.
Input Impedance: 100kΩ (unbalanced).
Weight: Around 30-36 lbs (13-16.3 kg).
Design & Features:
Design: High-current, direct-coupled design, often attributed to Nelson Pass.
Power Supply: Features a large toroidal transformer and substantial filter capacitors.
Indicators: Front panel LEDs signal power and high distortion levels (above ~1%).
Bridging: Rear switch allows for mono operation.
Protection: Thermal protection circuits.
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
