MIL-PRF-1/1097J
NOTE: The area below and to the left of the line is the area of permissible operation. Three hundred milliamperes is the maximum
peak current at any duty factor less than 1 percent. For any tube operating under the worst probable 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 for tube type 12AT7WC.
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