MIL-PRF-1/1729E
Dimensions
Ltr
Inches
Millimeters
Notes
Min
Max
Min
Max
Conformance inspection, part 2
A
.845
.909
21.46
23.09
B
.825
.875
20.96
22.22
D
.640
.669
16.26
16.99
F
.520
.537
13.21
13.64
K
.410
.425
10.41
10.80
R
.935
.950
23.75
24.13
1, 8
T
.440
.460
11.18
11.68
1, 4
U
.595
.607
15.11
15.42
1, 9
Conformance inspection, part 3
11
C
.702
.740
17.83
18.80
E
.782
.837
19.86
21.26
G
.022
.040
0.56
1.02
H
---
.250
---
6.35
J
.240
.275
6.10
6.98
M
.565
.580
14.35
14.73
P
.775
.785
19.68
19.94
W
---
.313
---
7.95
Reference dimensions
10
N
0.815
20.70
1, 4, 12
S
0.778
19.76
1, 9, 12
V
0.598
15.19
1, 8, 12
NOTES:
1. Total indicated runout (TIR) of contact surfaces shall be gauged from centerline of reference and shall be as follows:
Contact surface
TIR (max)
Reference
Grid
0.015
Anode
Cathode
0.015
Anode
Heater
0.015
Anode
2. See outline. Alternate heater-contact surface. Heater contact can be made to the bottom of the heater terminal-cup by
means of a coil spring having a maximum coil OD of. 390 inch (9.91 mm) and a minimum coil ID of .320 inch (8.13 mm), or
some similar device.
3. See outline. Anode, .3125-24 UNF-2A thread.
4. Heater-contact surface.
5. See outline. Reference surface. The tube shall be stopped only by this surface when screwed in the socket.
6. See outline. Insulating envelope. Do not clamp or locate on this surface.
7. See outline. Anode flange is for electrical contact; stud is for heat transfer and anode temperature measurement.
8. Grid-contact surface.
9. Cathode- or heater-contact surface.
10. Dimensions in electrode contact areas table are for socket design purposes and are not intended for inspection purposes.
11. These dimensions shall be checked on 10 tubes per month when in continuous production. Failure of any tube to meet
tolerances for any dimension shall cause that dimension to become, for all lots in process, part of conformance inspection,
part 2.
12. Silver plated 30 milligrams per square inch (msi) minimum plus gold strike.
FIGURE 1. Outline drawing of electron tube type 8538B.
6
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