MIL-PRF-1/1702C
TABLE I. Testing and inspection - Continued.
7/
All tests listed under conformance inspection, part 1, shall be performed at the conclusion of the holding period. The acceptance
level for each test shall be 0.65 (see MIL-PRF-1, table III).
8/
Test in circuit on figure 2 or equivalent. There shall be no indication of any arc during the 60 second test period.
9/
There shall be no indication of any arc during a test period of 60 seconds.
10/
Other tube contact configurations may be used provided the tube contact area remains unchanged and the socket, jig, or cavity
gives equal performance. Mounting of the socket, jig, or cavity may be at the option of the manufacturer.
11/
The applied voltage pulse shape shall be measured with a noninductive resistor of 1,150 ohms ±2 percent inserted in place of the
tube. The pulse shape shall be: tp = 0.4 µs maximum, and tf = 0.7 µs maximum. The pulse repetition rate (prr) shall be adjusted
so that Du = 0.0025 ±5 percent with the above measured pulse length. Test in cavity in accordance with Drawing 279-JAN (21/).
The cavity shall be connected to a load with a VSW R of less than 1.5:1. The oscillator output coupling and the grid or cathode
resistor may be adjusted for maximum power output.
12/
Grid-anode resonance: Test in cavity in accordance with Drawing 278-JAN (21/). Cavity shall resonate at 1354 ±2.0 MHz with
tuning slug in accordance with Drawing 277-JAN (21/) at TA = 25°C ± 5°C.
Grid-cathode resonance: Test in cavity in accordance with Drawing 283-JAN (21/). Cavity shall resonate at 1719 ±2.0 MHz
with tuning slug in accordance with Drawing 277-JAN (21/) at TA = 25°C ± 5°C.
W hen plotted on graphs of resonant frequency versus grid-anode capacitance and resonant frequency versus grid-cathode
capacitance, the tube under test (TUT) shall be represented by a point within the parallelogram whose four corners are located by
the following points:
Points
Capacitance (pF)
Frequency (MHz)
C-gp
C-gk
F-gp
F-gk
1
1.85
5.6
1980
1790
2
1.85
5.6
2010
1820
3
2.10
7.0
1910
1740
4
2.10
7.0
1940
1770
13/
The acceptance level shall be 6.5 (see MIL-PRF-1, table III).
14/
W hen tube type 8745 is physically identical to tube type 7815 (except for the installation of the transverse anode cooler assembly),
and has been made in the same production period as tubes which are being or have been tested to the applicable tube
specification sheet (TSS) for tube type 7815, then the one sample may represent both types insofar as the listed tests are identical.
15/
These tests shall be performed during the initial production and once each succeeding 12-calendar month period in which there is
production. A zero defect sampling plan shall be used, with sample of three tubes having an acceptance number of zero. In the
event of failure, the test shall be made as part of conformance inspection, part 2, with an acceptance level of 6.5 (see MIL-PRF-1,
table III). The regular "12 calendar month" zero defect sampling plan shall be reinstated after three consecutive samples have
been accepted.
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