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About the FM-90X
The Fisher FM-90X is a vintage mono FM broadcast tuner introduced in 1957 and manufactured through approximately 1961. It uses a nine-tube superheterodyne circuit with an RF stage and a 10.7 MHz intermediate frequency. The tuner covers the 88–108 MHz FM band and provides mono audio output along with a multiplex output for connection to a future stereo adapter or compatible audio equipment. It has an analog tuning scale and was designed for 105–125 V AC operation. The FM-90X is housed in a bookshelf-style cabinet and measures approximately 13.4 × 6.125 × 8.375 inches (340 × 156 × 213 mm).
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