This recommended document covers the following types of electron tubes for interelectrode capacitance testing within the conditions summarized in Article 4: Receiver tubes, cathode ray tubes, gas-filled tubes, photoelectric tubes and photomultiplier tubes, high-power vacuum tubes
SJ/Z 9009-1987 history
1970SJ/Z 9009-1987 Methods for measurement of direct interelectrode capacitances of electronic tubes and valves