MIL-PRF-1/1702C
NOTES:
1. Electrode contact surfaces and reference dimensions for eccentricity measurements.
2.
The total indicated runout of the anode and grid contact surface with respect to the cathode contact surface shall not exceed
0.020 inch (0.51 mm).
3.
The total indicated runout of the cathode contact surface with respect to the heater contact surface shall not exceed
0.012 inch (0.30 mm).
4.
All dimensions shall be tested on 10 tubes per month when in continuous production. Failure of more than one tube to meet
tolerances for any dimension shall cause that dimension to become, for all lots in process, part of conformance inspection,
part 2.
5.
Silver plated 30 MSI minimum. Note 4 shall apply.
6.
Plating not required over radiator of copper, aluminum, or approved equivalent.
7.
This surface shall be used for measurement of anode shank temperature.
8.
Inner edge of heater and outer edge of cathode rf connection shall be free from burrs and sharp edges.
9.
Total indicated runout (TIR) of contact surfaces shall be gauged from centerline of reference and shall be as follows. Grid rf
contact surface and reference dimension for eccentricity measurements.
Contact surface
TIR, maximum
Reference
Anode
0.020
Cathode
Grid
0.020
Cathode
Heater
0.012
Cathode
10.
Diameters N, R, T, and U shall apply throughout entire contact areas as defined by dimensions AA, AB, AC, and AD
respectively.
11.
Dimensions in electrode contact areas table are for socket design purposes and are not intended for inspection purposes.
FIGURE 1. Outline drawing for electron tube type 8745 - Continued.
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