Syncro scope and Audio tester are used for circuitry adjusting. Though they are half a century old enough, even now both of them are fully active with adequate calibrations. The company "TRIO" does not exists recently, but had been survived with other name, "KENWOOD".
These devices are indispensable for actual measurements and adjustment of hand making amplifiers.
Golden colored case includes transmitting circuitry driven by tubes, this is for Radio control air plane also 50 years ago.
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