MIL-PRF-1/1729E
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
.020 (0.51)
For all TIR measurements, the
Cathode
.020 (0.51)
reference is the anode thread
Heater
.020 (0.51)
pitch diameter ------see note 2
2.
The TIR measurement shall be made using gauge in accordance with figure 3 to attach to the tube anode and
reference the pitch diameter of the threads.
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 adjustment.
8.
Grid-contact surface.
9.
Cathode- or heater-contact surface.
10. 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.
11. Silver plated 30 milligrams per square inch (msi) minimum plus gold strike.
FIGURE 1A. Alternate outline drawing of electron tube type 8538B - Continued.
8
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