MIL-PRF-1/1648C(NAVY)
Dimensions
Ltr
Inches
Millimeters
Min
Max
Min
Max
Conformance inspection, part 2
C
1.870
1.900
47.50
48.26
G
4.600
4.800
116.84
121.92
H
.965
.988
24.51
25.10
J
.690
.710
17.53
18.03
K
.415
.435
10.54
11.05
L
.140
.165
3.56
4.19
M
.020
.030
0.51
0.76
P
.314
.326
7.98
8.28
U
.025
.048
0.64
1.22
V
.045
.070
1.14
1.78
Conformance inspection, part 3 (see note 2)
A
3.335
3.365
84.71
85.47
B
.807
.817
20.50
20.75
D
2.250
2.300
57.15
58.42
E
2.195
2.380
55.75
60.45
F
3.410
3.550
86.61
90.17
N
.700
.800
17.78
20.32
R
55
65
55
65
S
115
125
115
125
T
.470
.530
11.94
13.46
NOTES:
1. Dimensions H, J, K, L, and M shall be maintained within .100 inch (2.54 mm) from the outer peripheral edge of the contact
tabs.
2.
Dimensions shall be checked yearly. A regular double sampling plan shall be used, with the first sample of three tubes with
an acceptance number of zero, and a second sample of three tubes with a combined acceptance number of one. In the event
of failure, the test will be made as a part of conformance inspection, part 2, acceptance level 6.5, and inspection level S3.
The regular yearly double sampling plan may be reinstated after three consecutive samples have been accepted.
FIGURE 2. Outline drawing of electron tube type 8660.
6