Adcom GFA-545 Stereo Power Amplifier 100WPC Highly Regarded

Adcom GFA-545 Stereo Power Amplifier 100WPC – Highly Regarded.

Classic Nelson Pass–designed Adcom GFA-545 stereo power amplifier delivering 100 watts per channel of clean, high-current power with strong dynamics and control.

The Adcom GFA-545 is one of the most respected vintage solid-state power amps in its class, known for combining serious current capability, low distortion, and a neutral yet engaging sound signature. Rated at 100 watts per channel into 8 ohms and stable into 4 ohm loads, it comfortably drives a wide variety of loudspeakers, including many that challenge lesser amplifiers. Designed with a robust linear power supply, dual-mono-style channel layout, and high damping factor, the GFA-545 offers tight, authoritative bass, open midrange, and clean treble that still hold up against many modern amplifiers at significantly higher prices. This unit is in good cosmetic condition for its age, with typical light wear but no major damage, and has been tested to confirm proper operation.

Rear-panel RCA inputs and heavy-duty binding posts make system integration straightforward with both vintage and modern preamps and speakers. Generous headroom and very low noise make it an excellent match for revealing speakers or higher-sensitivity designs, where background hiss or hum from lesser amps can become intrusive. For many enthusiasts, the GFA-545 occupies a sweet spot between the smaller 535 and the bigger 555—offering enough power for most real rooms without the heat and size penalties of larger designs.

Key Specifications:

Power output: 100 watts per channel into 8 ohms (stereo)

Frequency response: 10 Hz – 20 kHz

Total harmonic distortion: 0.04%

Damping factor: 400

Gain: 27 dB

Input sensitivity: 1.25 V

Signal-to-noise ratio: 110 dB

Inputs: Stereo RCA line-level inputs

Outputs: Stereo speaker binding posts for left and right channels

Recommended speaker impedance: 4–8 ohms

Condition: Good cosmetic condition, fully functional

Dimensions: (Height x Width x Depth) 138 x 432 x 310 mm (5.4 x 17 x 12.2 inches)

Weight: 11 kg (24.3 lbs)

At just over 11 kg, the GFA-545 has the transformer, heat sinking, and capacitor bank you expect from a serious high-current power amplifier, contributing directly to its effortless dynamics and control at realistic listening levels.

This Adcom GFA-545 remains a highly capable choice for building a powerful, great-sounding two-channel system or for adding serious amplification to the front channels of a home theater setup, especially when paired with a quality preamplifier or modern DAC/pre.

Backed by Radique Audio’s 90-day warranty and our perpetual trade-back policy, you can purchase with confidence; asking $495.