MIL-PRF-1/1618C
NOTES:
1. All solder joints on waveguide assembly shall be soldered to provide a hermetic seal at surface (F).
2.
The .020 inch (0.51 mm) tolerance of .281 inch (7.14 mm) dimension includes angular as well as lateral deviations of the
surface. These dimensions define relation of surface (F) to respective holes.
3.
This diameter shall be concentric with the diameter of the flange within .005 inch (0.13 mm).
4.
This diameter shall be concentric with opening in waveguide within .010 inch (0.25 mm).
5.
The opening in the waveguide shall be enclosed by a dust cover when the tube is not in use.
6.
Center line of waveguide opening.
7.
To increase frequency, drive this end of worm shaft in counter clockwise direction. Complete frequency range covered in
approximately 20 turns. Tuning mechanism shall operate over the entire mechanical range when subjected to a torque of 10
inch-ounces applied at the worm shaft. In equipment no less than 10 inch-ounces nor more than 2,500 inch-pounds shall
be applied at drive shaft. The gear teeth and worm threads must be free from corrosion, paint, and other imperfections.
8.
Number appearing here indicates number of complete revolutions of gear. With the geneva and gear set near 3 and zero
respectively, the frequency of the tube is approximately 9,000 MHz.
9.
It shall be possible for a sleeve .195 inch (4.95 mm) I. D. x .406 inch (10.31 mm) O. D. x 1.000 inch (25.40 mm) long to
pass over ends of shaft to face of worm shaft housing.
10. Four .193 .003 inch (4.90 0.08 mm) diameter holes. An area of .219 inch (5.56 mm) radius located from the center of
each of the four holes to be free from finish.
11. The jack holes shall be within a radius of .023 inch (0.58 mm) of the specified location but shall be spaced .500 .010 inch
(12.70 0.25 mm) with respect to each other, the center lines of the jack holes shall be perpendicular to mounting plate
within 3 .
12. `C' indicates adjacent jack is the common heater-cathode connection.
13. With .062 inch (1.57 mm) seat resting on a plane surface the flatness of the seat shall be such that a .010 inch (0.25 mm)
thickness gauge .125 inch (3.18 mm) wide shall not pass under.
14. All solder joints on base plate shall be soldered to provide a hermetic seal.
15. Any portion of the assembly extending below this surface shall be within a 1.109 inch (28.17 mm) radius on the true center
of the plate.
16. All metal surfaces covered by finish except surfaces (D) and (F) drive and stop mechanism (K) surface around holes as
specified in 10/, parts associated with insulator (L).
17. Locking type jack: See latest issue of MIL-PRF-1.
18. Hex head banana pin jack .594 inch (15.09 mm) long, hole .169
.005 inch (4.29
0.13 mm).
19. Finish may be omitted from the edges and back of waveguide.
20. Warning: maintain minimum 2 inches (50.8 mm) clearance between this magnet and magnetic materials (magnets, steel
tools, plates, etc.).
FIGURE 1. Outline drawing of electron tube type 7256 - Continued.
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