McIntosh Mac-1700 Receiver
This is a receiver of the early '70's which has the distinction of
being a hybrid. The tuner is tube while the preamp and power amp are
solid state. It is not large, weighing in at 45 watts rms/channel but
will power relatively efficient speakers very well. These will
require all of the usual cleanups of controls, tube sockets, tuning
capacitor, and switches. The tuner will often require tubes and
alignment. They have rather large capacitors for positive and
negative power supply and these often go bad, causing hum or
distortion in both channels. There are other supply caps which are
prone to failure. MAC1700's have been known to occasionally pop their
supply fuses, (located in the fuse block underneath) and they will
sometimes damage speakers due to an intermittent dc offset problem (dc
appears at the speaker terminals). This is caused by the differential
amp transistors on the small driver boards underneath. These must be
replaced on every machine, regardless of what other repairs are
needed. After all this is done, do the cosmetic to make it beautiful
and enjoy.
|
