MIL-PRF-1/148E
NOTES:
1.
The following circuit conditions shall apply for all tests:
a.
Anode and grid circuit returns to center tap of secondary of filament transformer.
b.
Filament transformer terminals phased so that tip of mogul base is positive relative to shell and when anode is
positive.
2.
Characteristics shall be within specified limits.
3.
Apply rated filament and anode voltage simultaneously for a 3-minute period with the load at 1.0 ampere dc and then
allow the tube to cool for 15 minutes. This application shall be repeated 500 times.
4.
The anode voltage shall be lowered until the tube cuts off. The anode voltage at the instant after the tube cuts off shall be
within the limit specified.
5.
Measure power loss in the tube with a wattmeter. The power loss divided by the anode current (in amperes, as measured
on a dc meter) shall be within the limit specified.
6.
The anode voltage shall be increased to 210 V ac, with the anode current held at a value not greater than 6.4 A dc. The
grid bias shall be increased in a negative direction until the tube cuts off, and shall be within the limit specified.
7.
After no-load operation, tubes shall be within specification limits for operation and grid current. In the operation test, the
time of operation shall be a minimum of 30 seconds and a maximum of 120 seconds.
8.
The maximum peak forward voltage shall not shift more than 120 volts.
9.
This test shall be performed according to the life testing schedule given in MIL-PRF-1 paragraph 4.3.8.
4
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