1975 McIntosh MPI-4 "Maximum Perfomance Indicator"
Fully serviced units in Ex Cond.
"The McIntosh MPI 4 is a laboratory grade instrument providing the facility to continuously monitor the quality of the performance of a stereo system.
The MPI 4 can sample and display signals from the tuner, preamplifier and power amplifier without reconnecting cables.
Signals are displayed on an oscilloscope screen calibrated with scales for tuning, measuring and testing."
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