Russian standards PDF
Low-power electronic tubes or valves. Methods of test and measurement under rectifying conditions
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Method of measurement of output power and non-linear distortions of electronic tubes and valves under test in the conditions of low-frequency amplification
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Low-power electronic tubes and valves. Methods of measurement of amplification factor
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Low-power electronic tubes. Mutual-conductance test methods
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Low-power electronic tubes and valves. Method of measurements of plate resistance
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