MIL-PRF-1/1757B
NOTES:
1.
Insulation material between heater and heater-cathode shall be securely affixed.
2.
Dimensions in electrode contact area table are for socket design purposes and are not intended for inspection
purposes.
3.
Silver plated 30 MSI minimum.
4.
Plating not required over radiator and radiator support of copper, aluminum, or approved equivalent.
5.
This surface shall be used for measurement of anode shank temperature.
6.
Holes for tube extractor through top fin only.
7.
Inner edge of heater and outer edge of cathode rf connection shall be free from burrs and sharp edges.
8.
This fin shall withstand a 6-inch (153 mm) drop test without loosening and without distortion as judged by
ability to maintain dimension K.
9.
Distortion of fins permissible provided distance between adjacent fins at any point on circumference meets
tolerances for dimension K.
10.
Eccentricity of contact surfaces shall be gauged from center line of reference and shall be as follows:
Contact surface
TIR maximum
Reference
Anode
0.020
Cathode
Grid
0.020
Cathode
Heater
0.012
Cathode
11.
Diameters N, R, T, and U shall apply throughout entire contact areas as defined by dimensions AA, AB, AC,
and AD respectively.
12.
This surface shall not be used for clamping or locating.
FIGURE 1. Outline drawing of electron tube type 8965 - Continued.
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