'60s McMARTIN TR-66 FM-SCA MULTIPLEX RADIO RECEIVER transistors muzak VINTAGE

Description

vintage McMartin FM-SCA Multiplex Receiver
model TR-66 -- multi tranistorized unit  --
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overall moderate wear: loss of finish / tarnish to the deck / a little rust patching on the chassis and transformer -- powers on without incident but light on front does not 'light up' --- not otherwise able to test so sold for parts/repair
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from a Telos blog post by Tom Vernon:
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Typical of 1960s equipment, the TR-66 featured battleship-quality construction, and, like most McMartin SCA gear, had a reputation for reliable operation and long life. The chassis featured modular, straight-line design with numerous test points and transistor sockets, making them easy to align and service. The units were hand-wired, and the quality of craftsmanship was excellent. An optional LT-10 3-watt audio amplifier could be plugged into an octal connector on top of the chassis, making the TR-66 a tuner-amplifier in one chassis.
The TR-66 was crystal controlled, and extremely stable. If the frequency was changed or alignment needed to be checked, it was simply a matter of connecting a VTVM to the correct test points, peaking up the local oscillator until the voltage dropped to 2/10 of a volt above peak to ensure positive starting. Next connect to the AGC test point and tune the antenna coil, RF coil mixer coil and doubler coil for minimum positive voltage at the AGC test point. Then, set the RF mute level control to cut off around 5 microvolts of RF input level, and then adjust the subchannel mute
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*always listing cool vintage tech
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