Lovely pair of Audio Research Reference 600 Amplifiers.These are MK3 Version.In excellent original condition,with only a few tiny marks, camera wont easily pick up.In October 2023, one monoblock had a complete service,by AR Specialist,,(including complete set of tubes)at £3041.This week the other monoblock has had same service,complete with new tubes at £2999.86(copy reciepts fowarded to new owner.Units will be shipped by palletised service,packed in wooded crates.UK buyers,we maybe able to arrange personal delivery.Please contact.