MIL-PRF-1/945E
NOTES:
1. Section of waveguide M85/1-073-120.
2. Reference plane A is defined as that plane which coincides with the face of the mounting plate.
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Qualification inspection applies.
4. Jacks shall be locking type as illustrated in MIL-PRF-1. The centerline of the jack holes shall be within .023 inch (0.58 mm)
of reference plane B, and shall be perpendicular, within 3° of reference plane A.
5. Insulator shall be pyrex glass, porcelain, or approved equivalent.
6. Common heater-cathode connection shall be identified by the letter C.
7. Filament leads shall be flexible and slack, and shall be soldered to terminal clips.
8. All metal surfaces shall be painted with heat resistant, noncorrosive paint except surfaces A, B, and C which shall be free
from paint.
9. It is recommended that asbestos gasket shall not be used unless other type of gaskets cannot meet performance
requirements.
10. With surface A resting on a plane surface, flatness of mounting plate .500 inch (12.70 mm) from outer edge shall be such
that a gauge .010 inch (0.25 mm) thick and .125 inch (3.18 mm) wide will not enter more than .250 inch (6.35 mm).
Conformance inspection, part 2, applies.
11. Protective cover shall be provided for output flange.
12. Tolerances include angular and lateral deviations.
13. Reference plane B is defined as that plane which passes through the centers of holes H and H1 and is perpendicular to
reference plane A.
14. Any portion of the assembly within this area shall lie within a 1.109 inch (28.17 mm) radius of the true center of the mounting
plate.
15. Output flange and open end of waveguide shall be concentric within .010 inch (0.25 mm).
16. W aveguide assembly shall provide hermetic seal with output flange.
17. Coaxial tube shall provide hermetic seal with surface A.
18. Reference plane C is defined as that plane which passes through the center of hole H1 and is mutually perpendicular to
reference planes A and B.
19. Unless otherwise specified, the acceptance level for all tests listed under conformance inspection, part 1, shall be 1.0 in
accordance with MIL-PRF-1, Table III, accept on zero (c = 0) sampling plan.
FIGURE 1. Outline drawing of electron tube types 2J49 and 2J50 - Continued.
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