MIL-PRF-1/1657E
Dimensions
Ltr
Inches
Millimeters
Notes
Min
Max
Min
Max
Conformance inspection, part 1
C
.555
.605
14.10
15.36
G
.535
.575
13.59
14.60
H
.320
---
8.13
---
Y
.650
.700
16.51
17.78
Conformance inspection, part 2
A
---
.230
---
5.84
B
---
.180
---
4.57
D
.165
.205
4.19
5.20
E
.049
.055
1.24
1.40
F
.120
.150
3.05
3.81
J
.245
.252
6.22
6.40
2, 4
K
---
.115
---
2.92
L
.335
.355
8.51
9.01
M
.048
.068
1.22
1.73
N
.547
.557
13.89
14.15
3
Q
---
.010
---
0.25
R
.095
.125
2.41
3.17
S
---
1.360
---
34.54
U
.095
.135
2.41
3.43
V
.020
.030
0.51
0.76
W
.110
.120
2.79
3.05
X
---
.065
---
1.65
5
Reference dimensions
AA
.015 RAD
0.38 RAD
AB
.030 RAD
0.76 RAD
AC
.060
1.52
NOTES:
1. Reference plane "A" is defined as that plane against which annular surface "B" of the grid flange abuts.
2. The axis of the anode terminal shall be coincident with the axis of the cathode terminal within 0.010 inch
(0.25 mm).
3. The axis of the cathode terminal shall pass through the exact center of the grid flange (dimension N) within
0.005 inch (0.13 mm).
4. With annular surface "B" resting on reference plane "A", the axis of the cathode terminal (dimensions H and J)
shall be within 2 degrees of a line perpendicular to reference plane "A".
5. Leads shall be tinned except as specified by dimension X. Untinned length of leads shall be measured from
end of ceramic stem wafer.
FIGURE 1. Outline drawing of electron tube type 8727 - Continued.
7
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