I have way more amps than I need at this point. I purchased this from the original builder back in the days. The unit is in good condition with normal wear due to the age. There are minor scratches on the surface. The unit otherwise looks very good. I am putting the condition as “fair” to be very conservative. This one has 128 step resistor ladder volume control with remote.

Beta 22 is one of the best amplifiers for dynamic headphones. The sound profile is powerful with some added warmth. Here is an impression that captures the sound profile well: https://www.head-fi.org/threads/the-woo-wa6se-and-beta22-sigma22-amps-face-off-review-posted.548400/#:~:text=The Woo is warmer and,though they're not identical.

Please do not hesitate to make an offer or ask anything you may wish to know.

The Amplifier (Beta 22):

2-channel configuration
1 RCA input
1 RCA Preamp Out
128 step R-2R attenuator
LCDuino digital display
Shielded transformer
2x24VDC power supply by sigma22
Separate transformer for the front LCD display
Shielded AC input
Front "standby" button

Amplifier can power both headphone out and preamp out at the same time (although both outputs would be controlled by the same volume attenuator).

Additional Reading Materials
https://www.amb.org/audio/beta22/

I would prefer to ship to CONUS only. Buyer pays actual shipping. PayPal G&S only (for your protection). 100 post min required - would like to keep this one within the Headfi community.