KK6HY's

General Radio Amplitude-Modulation Monitor, Model 1931-A
and
General Radio Distortion and Noise Meter, Model 1932-A

--- the AM broadcaster's dream test set in 1948 ---

GR Models 1931-A & 1932-A
GR Model 1931-A
GR Model 1931-A
GR Model 1932-A

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