PS Audio GCHA Headphone Amplifier-XLNT condition

purchase new in 2010, Cost new: 999 plus shipping

(3 pin sized marks on top right edge)

Original Manual, Box, A/C cord

Works with Windows & MAC O/S

Good combination with HD600,HD650,GRADO RS-1

From PS Audio:
 

"The GCHA has 4 parts to it: the input stage, the Gain Cell, the Class A output power amplifier and the power supply itself.

The input stage is divided into two parts: digital and analog. The digital side of things is handled by a USB port that connects to any computer, Macintosh or Windows based.  All the drivers and “stuff” you need to help your computer recognize the GCHA is built right in.  It’s actually pretty cool, you simply plug the GCHA into your computer, and the computer takes over and installs everything for you.  Once you’re plugged in and going, you need only slip a CD into your computer’s CD or DVD player and away you go with music through the computer’s music software.  Or, you can stream live radio, download music, play it from your hard drive.

The analog inputs are conventional high-end audio inputs through RCA connectors that you can access the output of your preamplifier, your CD player directly or any music source you might have.  Just plug it in and go.

Regardless of the music source, once you have audio in to the GCHA, it is fed directly into the PS Audio Gain Cell.  Gain Cells are unique in that they have fully adjustable gain without any attenuation.  Using the front panel control, you adjust the gain of the amplifier directly to match exactly what your listening needs are.

From the Gain Cell, the signal is fed into a discrete Class A power amplifier that puts out a couple of watts; more than enough to drive any manner of headphone with warmth and dynamics in a low noise setting.  One of the challenges we faced with this amplifier is the level of scrutiny a listener will display.  Remember, this small power amplifier is feeding “speakers” that are about an inch away from your ear, so it’s critical that the electronics be first rate.

To finish off the GCHA internals we added a huge power supply with a large bank of capacitors and regulated power supply.  PS Audio has long been a fan of oversized power supplies to help maintain dynamics, warmth and openness of the music and the GCHA is no different."

Dimensions: 8.5"W x 2.75"H x 15"D. Weight: 8 lbs.