MIL-PRF-1/99E
NOTES:
1. Voltage tolerance ±15 percent. Measure voltages without a tube in the socket, using a rectifier type voltmeter (500 ohms per
volt minimum) or an average-reading type VTVM, such as the Hewlett Packard 400 series. Ballantine 300 or 310, or the RCA
Junior Voltohmyst, or equivalent. Peak reading meters such as the RCA Senior Voltohmyst will not agree with the above figures
for voltage at the terminals. The Voltohmyst shall be isolated from ground and from the technician during the measurement, as
its case is connected to its common test lead.
2. Use a hexaphase supply connected to a ring potentiometer. Each tube element (except cathode) is connected through a neon
lamp to an appropriate point on the ring potentiometer.
FIGURE 1.
Hexaphase short and discontinuity test.
4
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