MIL-PRF-1/1427G
TABLE I. Testing and inspection - Continued.
Inspection
Method
Notes
Conditions
Acceptance
Symbol
Limits
Unit
MIL-STD-
Level
11/
Min
Max
1311
Conformance inspection,
part 3
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9/
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Service-life guarantee
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Vibration, mechanical
1032
4/ 5/
Accel = 5 G peak (min);
14 to 200 Hz;
accel = 2 G peak (min);
200 to 500 Hz;
F = 14 to 500 to 14 Hz;
no voltages applied
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Vibration, mechanical
end-points:
A ac
4/ 6/
1.5
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1301
Filament current
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ĆIf
V dc
-127
-95
1261
Electrode voltage (grid)
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Ec1
-25
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1266
Total grid current
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µA dc
Ic1
Shock, specified pulse
1042
4/
Condition A
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Shock, specified pulse
end points:
4/ 6/
1301
Filament current
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1.5
A ac
ĆIf
1261
Electrode voltage (grid)
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-127
-95
V dc
Ec1
1266
Total grid current
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-25
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Ic1
µA dc
1/
Minimum airflow requirements for incoming air at 50°C maximum at sea level are shown in table IA. In all cases of operation, a
socket which provides forced-air cooling of the base shall be used (such as EIMAC SK-300 with SK-306 chimney or equivalents,
or SK-300A chimney, or equivalents) and maximum anode core and seal temperature ratings shall not be exceeded. The static
pressure drop values shown in table IA are for the tube and socket, with an SK-306 chimney, or equivalent installed. This pressure
drop varies with the amount of escaping air and with the shape and construction of the air director (chimney). Ratings apply for
bias voltage less than 500 volts and frequencies less than 100 MHz. Air cooling of the tube shall be increased with increasing
negative bias or with increasing frequency. The airflow shall be applied before or simultaneously with electrode voltages, and shall
be maintained for a minimum of 2 minutes after all voltages are removed.
TABLE IA. Minimum airflow requirements.
SK-300 1/
SK-300A 1/
Anode
Airflow
Approximate pressure
dissipation
Airflow
Approximate pressure
(cfm)
(watts)
(cfm)
drop (In. H2O)
drop (In. H2O)
0.4
75
0.4
75
2,000
0.7
105
0.7
100
3,000
1.1
145
1.2
135
4,000
1.5
190
1.8
165
5,000
2.0
230
2.5
200
6,000
3
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