Audio Research REF 6 GBP 5250 + REF 150SE GBP 5250
 
REF 6 + REF 150 SE in pristine condition. This ultimate ARC combination of preamplifier - power amplifier was built on Dec. 22nd, 2016, can power the most demanding of speakers. Never been loaned, always played together in my home, no scratches or scuff marks. All accessories accessories included. Original 220-240v model. 
 
https://www.stereophile.com/content/audio-research-reference-6-line-preamplifier