For sale, we have a PS Audio HCA-2 Hybrid Class A Stereo Amplifier in perfect working order. The amp has been serviced, including replacing defective output transistors, and setting the DC offset. The amp was then put on our bench where it went through our amplifier testing process. A 1k sine wave was run into the amp, while monitoring the output on our scope via a sine wave for signs of distortion or noise. Once we established there were no issues, we then slowly ran the amp up to full rated power using a dummy load provided by our Sencore PA81 power amplifier analyzer. The amp performed as it should and ran clean at 150 watts per channel at 8 ohms. Finally, we ran the amp in one of our house systems for several days where it performed beautifully. Physically the unit is in very good to excellent condition, with only minor blemishes, no dents, and no deep scratches. See pictures for further details on its physical condition.
Included in the sale are the amp, original owners manual, display light adjustment tool, a generic AC cord, and original box with packing.
More from PS Audio:
Congratulations! You have just taken a step into an incredible new dimension of the audio world. The Hybrid Class A stereo amplifier, or HCA-2, represents a revolution in the innovation and design of amplifier technology.
Analog-only amplifier circuits have been refined over and over for the last 100 years to a point where we hardly expect to gain any further significant achievements. Attempts have been made at pure digital designs only to yield results that certainly leave much more to be desired.
The HCA-2 is an audiophile’s first look at these two concepts being blended into one: a hybrid amplifier with a fully balanced, Class A input stage and a truly state-of-the-art digital output section known as SDATTM.
Design Overview
The HCA-2 is a stereo (two-channel) amplifier rated at 150 watts per channel into 8 ohms. It is comprised of two main stages: the input stage and the output stage.
The input stage is the heart and soul of the HCA-2’s sound. A fully balanced, Class A input stage that can be fed by either single-ended RCA connectors or the balanced XLR type.
The output stage of the HCA-2 is our unique Super Digital Amplification Technology SDATTM circuitry that provides an absolutely linear response into any loudspeaker load. SDAT circuitry is not load sensitive which assures that the frequency response will not change regardless of the loudspeaker load.
The HCA-2 represents a state of the art power amplifier that is affordable, efficient, and can be used to glorify the beauty and passion of recorded music in ones home. We trust you will enjoy the HCA-2 for years.
Specifications:
Solid-state, two-channel "Hybrid class-A" power amplifier with class-D switching ("SDAT") output stage.
Inputs: 2 pairs line-level (1 pair RCA, 1 pair XLR).
Output: 4 WBT multiway binding posts.
Power output: 150Wpc into 8 ohms (21.8dBW), 225Wpc into 4 ohms (20.5dBW), 275Wpc into 2 ohms (18.3dBW).
Frequency response: 10Hz-20kHz, ±0.5dB.
THD+N: <0.2% at full rated power into 8 ohms (1kHz).
Input sensitivity for full output: 1.15V.
Input impedance: 100k ohms.
Voltage gain: 30dB.
Dimensions: 17" W by 4.5" H by 14" D. Weight: 30 lbs.