IEC 60151-21:1969 Measurements of the electrical properties of electronic tubes. Part 21 : Methods of measurement of cross-modulation in electronic tubes and valves
Does not apply as a recommendation in the sense of a standard because of the absence of detailed description of measuring methods. The definitions and the theory are outlined. The principle of the measuring methods described is the determination of the u
IEC 60151-21:1969 history
1969IEC 60151-21:1969 Measurements of the electrical properties of electronic tubes. Part 21 : Methods of measurement of cross-modulation in electronic tubes and valves