MIL-PRF-1/1225F
TABLE I. Testing and inspection - Continued.
Inspection
Method
Conditions
Acceptance Symbol
Limits
Unit
MIL-STD-
Level 11/
1311
Min
Max
Conformance inspection,
part 3 - Continued
---
Life-test end points
(intermittent) (500 hours)
---
---
---
---
---
---
Inoperatives
µA dc
Ic1
---
-0.9
1266
0
Total grid current
If
---
315
1301
285
Heater current
mA
ĆSm
---
20
1306
---
Change in transconduc-
%
tance (1) of individual
t
tubes
ĆSm
---
15
1306
---
Transconductance (2)
%
Ef
µA dc
---
30
1336
---
Heater-cathode leakage
Ihk
MegΩ
---
---
1211
10
Insulation of electrodes
R
---
15
1306
---
Transconductance (1)
%
Avg
ĆSm
average change
t
---
---
---
---
Total defectives
---
---
Life-test end points
---
(Intermittent) (1,000 hours)
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---
---
---
---
Inoperatives
---
µA dc
Ic1
-0.9
---
0
Total grid current
1266
If
315
---
285
Heater current
1301
mA
ĆSm
25
---
---
Change in transconduc-
1306
%
tance (1) of individual
t
tubes
µA dc
30
---
---
Heater-cathode leakage
1336
Ihk
MegΩ
---
---
10
Insulation of electrodes
1211
R
---
---
---
Total defectives
---
---
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1/
See "Reduced pressure (altitude) rating", and altitude, maximum peak voltage.
2/
This test to be performed at the conclusion of the holding period.
3/
Prior to this test, tubes shall be preheated a minimum of 5 minutes at the conditions indicated below. The 3-minute test is not
permitted. Test at specified conditions within 3 seconds after preheating. Grid emission shall be the last test performed on
the sample selected for the grid-emission test.
Ef
Ec1
Ec2
Eb
Rk
V dc
V dc
V dc
V dc
Ohms
7.5
+9
160
190
630
4/
The rejection level shall be set at the VU meter reading obtained during calibration.
5/
Pin 6 floating.
4
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