MIL-PRF-1/779K
The area below and to the left of the line is the area of permissible operation. Nine hundred milliamperes is the maximum peak
current at any duty factor less than 1 percent. For any tube operating under the worst possible conditions, the point indicating peak
cathode current and percent duty factor and the point indicating peak-cathode current and pulse width should both be in the area of
permissible operation. Duty factor is defined as the ratio of the average current to the maximum peak current occurring in any
1,000-microsecond period.
FIGURE 1. Pulse rating chart.
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