This amplifier I got given to me from her dad's collection including four pairs of Heco Lab 2 reference speakers. In total we were given five of these units. Im not 100% sure how much they were brand new but know they go or around £800 secondhand nowhere days . The construction quality is excellent on everyone of the units, with hand wound transformers and resistors, hand soldered parts and case and heatsinks which are built like a tank! I have now been using the system as a reference system for about three years now and thoroughly recommend the amplifiers to anybody! Apparently according to literature whch came with them, these amps are meant for professional custom built installation systems and studios like EMI have extensively used these units for final testing of track before and after final mastering! Which is pretty cool!