MIL-PRF-1/334C
TABLE I. Testing and inspection.
Inspection
Method
Conditions
Acceptance level Symbol Limits
Limits
Unit
(see note 4)
Min
Max
Conformance
inspection, part 1
-0.5
0
Ic
0.65
Eb = 6,000 V, see note 2
1266
Total grid current
µA dc
---
32
Is
0.65
Eb = Ec = 30 V dc,
1231
Emission
mA dc
see note 2
1.6
0.9
Ik
0.65
T = 60; Eb = 6,000 V,
1256
Electrode current
mA dc
see note 3
(cathode)
---
---
---
---
0.4
1201
Short and discontinuity
detection
Conformance
inspection, part 2
mA
325
275
If
---
1301
Heater current
30
---
Ihk
---
1336
Heater-cathode leakage
µA dc
1,125
675
Sm
---
Eb = 1,500 V dc;
1306
Transconductance
µmhos
Ec = -1 V dc; Rk = 0
520
380
Mu
---
Eb = 1,500 V dc;
1316
Amplification factor
---
Ec = -1 V dc; Rk = 0
0.90
0.60
Cgp
---
No shield
1331
Direct-interelectrode
pF
6.0
4.0
Cin
capacitance
pF
2.6
1.2
Cout
pF
---
---
---
---
1211
Insulation of electrodes
---
200
---
Ep
---
Eb = 300 V dc; Ec = 0;
1031
Low-frequency vibration
mV ac
Rp = 10,000 Ω
---
---
---
---
1111
Base pin solder depth
---
---
---
---
---
1101
Secureness of base, cap,
---
or insert
---
---
---
---
1105
Permanence of marking
---
Conformance
inspection, part 3
---
---
---
---
---
Group C; Ehk = 300 V
---
Life-test provisions
mA dc
---
0.75
Ik
---
Electrode current
---
Life-test end point
(cathode)
(500 hours)
NOTES:
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. Initial arcing may be tolerated, but tubes shall be free of arcing at the conclusion of the test.
4. This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
2