McIntosh MPI 4
Maximum Performance Indicator (1975)
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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