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3 stage audio amplifier

3 stage audio amplifier

General Radio Company
1982 calendar on science at Harvard

1982 calendar on science at Harvard

Harvard University
dated 1982
Audio instrument, oscillator. Large rectangular body, wood frame on sides, black front panel and decorative grill on to pand back. On front panel, large dials, circular window for meter, pair of electrical connectors, indicator light and switches.

Audio instrument, oscillator. Large rectangular body, wood frame on sides, black front panel and decorative grill on to pand back. On front panel, large dials, circular window for meter, pair of electrical connectors, indicator light and switches.

General Radio Company
1939
audio oscillator, 600-Hz

audio oscillator, 600-Hz

General Radio Company
1925-1930
beat frequency audio oscillator

beat frequency audio oscillator

General Radio Company
circa 1930
beat-frequency oscillator

beat-frequency oscillator

General Radio Company
circa 1935
beat frequency oscillator

beat frequency oscillator

General Radio Company
circa 1925
box of vacuum tube bridge parts

box of vacuum tube bridge parts

General Radio Company
1950-1960
coil

coil

William J. Murdock Company
condensing coil

condensing coil

Wireless Manufacturing Company
DC galvanometer

DC galvanometer

General Radio Company
circa 1925
demonstration amplifier

demonstration amplifier

Cruft Laboratory, Harvard University
1920-1930
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