Ayre Acoustics KX-R Twenty

This is Ayre's top-of-the-line preamp.  It is highly acclaimed as one of the best sounding preamps ever made.  If you are looking for one, you are likely already familiar.
This unit is in excellent condition.  I could not find a scratch on it but rated 9/10 as it has been out of the box. 
Prefer wire transfer.  if paying with PayPal, add 3%.  

From Ayre:

Variable Gain Transimpedance (VGT) volume circuit
Ayre’s exclusive Diamond output circuit
AyreLock power supply
zero-feedback
fully-balanced discrete circuitry
60 step volume control, each of 1.0 dB
Equilock circuitry for active gain devices
Input ground switching for true source isolation
Eight inputs: four balanced, four single-ended
Two balanced outputs, two balanced tape outputs
Dimmable silent-mode fluorescent display
Ultra-high-speed circuit board material
Fly-by-wire control system
Solid aluminum monocoque chassis
Ayre Conditioner Power-Line RFI Filter
Programmable processor pass-through input
Full-function remote control operation

From Stereophile: Stereophile review: https://www.stereophile.com/content/ayre-acoustics-kx-r-twenty-line-preamplifier

• Description: Remote-controlled line preamplifier

• Analog inputs: 4 balanced (pin 2 hot), 4 unbalanced

• Analog outputs: 2 pairs balanced on XLRs (pin 2 hot), 2 pairs balanced tape (pin 2 hot)

• Other inputs/outputs: 2 AyreLink ports

• Gain range: Variable Gain Transconductance topology in 60 steps of 1dB

• Frequency range: DC–250kHz

• Input impedance: 2 megohms, balanced; 1 megohm, unbalanced

• Output impedance: 150 ohms, single-ended (when used with an adapter); 300 ohms, balanced

• Dimensions: 17.1" (438mm) W by 3.7" (95mm) H by 11.4" (292mm) D. 

• Weight: 40 lbs (18kg)

• Price: $27,500

Manufacturer: Ayre Acoustics, Inc., 2300-B Central Avenue, Boulder, CO 80301. Tel: (303) 442-7300. Fax: (303) 442-7301. 
Web: www.ayre.com.

Read more at https://www.stereophile.com/content/ayre-acoustics-kx-r-twenty-line-preamplifier-specifications#xmzdFs728RmWclh3.99