If you were ever in doubt about the quality of Marantz products this amplifier should reassure you. Designed and built in the mid 1970's it uses a high quality rigid chassis and top quality components including Elna electrolytic capacitors and and for lower value non-electrolytic, polystyrene capacitors when called for, still specified today as top performers. Also extruded aluminium heat sinks and heat sinks on the driver transistors. The bias and offset pots (seen on the upright board top left & right) are top quality. I expect you may be waiting for the reason for failure and diagnosis of this amp; well it's almost completely untouched by human hands since the day it was made, and it probably was made by hand not robot, The only thing I did to this amplifier was clean the controls....just because I wanted to and needed to do something, not because it needed it. Have a look at the photo of the power transformer; the connecting wires are connected using a screw down terminal block! Very unusual. Marantz have always been a bit different; power switch and transformer are on the right hand side as are the speaker connections, inputs are on the left hand side, completely opposite to most amplifiers, today or yesterday...is this a left handed amplifier? (rhetorical). All that but does it sound any good? does it what!! I really will be surprised if you don't like this amplifier even compared to modern expensive amps. It is a fantastic magical amplifier, if you read all the hype, particularly around the Model 1060, well its all true and then some; why? can only think that it was the brainchild of Saul Marantz who would not compromise and was a design genius. My first proper amplifier was the Marantz 1060 bought in 1978 chosen by listening to it. (See the Marantz 1060 entry for the story)