MIL-PRF-1/1120G
NOTES:
1. Insulation material is required between heater and heater-cathode and shall be securely affixed.
2. These dimensions shall be tested on 10 tubes per month when in continuous production. Failure of one or more tubes to meet
tolerances for any dimension shall cause that dimension to become, for all lots in process, part of conformance inspection, part 2.
3. Silver plated 30 MSI minimum. Note 2 shall apply.
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 drop test without loosening and without distortion as judged by ability to maintain dimension K.
Note 2 shall apply.
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. Note 2 shall apply.
Contact surface
TIR, maximum
Reference
Anode
.020 (0.51 mm)
Cathode
Grid
.020 (0.51 mm)
Cathode
Heater
.012 (0.30 mm)
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. Dimensions in electrode contact areas table are for socket design purposes and are not intended for inspection purposes.
13. This surface shall not be used for clamping or locating
FIGURE 1. Outline drawing of electron tube type 7289 - Continued.
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