I am getting a pair of 845 amps so time for these Cary mono blocks to find a new home. These are 20 watts of pure class A single ended amplification. The 572-3 is a low-mu audio triode with a thoriated-tungsten filament, graphite anode and hard glass. The amps were recapped and upgraded to Hexfred's at Cary in August of 2013 (invoice included). You get the two mono block amplifiers, two Shunyata power cords, owner's manual, a full compliment of tubes and these extra tubes: one SV-572-3 ($164 from New Sensor), one 5R4GYB, two 6BL7, and two 6SL7. They will ship in original factory cartons (double boxed). Asking $1800 plus shipping.