MIL-PRF-1/1738D
FIGURE 1. Outline drawing of electron tube type 8939 - Continued.
NOTES:
1. Reference plane "A" is defined as a plane passing along the face of the mounting plate.
2.
Reference plane "B" is defined as a plane perpendicular to plane "A" passing through the axis of the holes, as shown at
reference plane "A".
3.
Reference plane "C" is defined as a plane mutually perpendicular to planes "A" and "B" passing through the axis of the holes,
as shown at reference plane "A".
4.
Includes angular as well as lateral deviations. Dimension E is to centerline (
) of waveguide and dimension M to
of
heater terminal.
5.
Anode temperature to be measured at this point.
6.
Input bushing temperature to be measured at this point.
7.
For vibration of shock testing, the planes of testing shall be reference planes "A" - "B" - "C".
8.
W ARNING: Maintain minimum clearance of 4 inches between magnet and magnetic materials (magnets, steel tools, and
plates) Use no magnetic inspection tools.
9.
Protective closure. To be removed before tube is used, and attached when the tube is not in use.
10.
The inner laminations of the cooling fins are not painted. However, there may be an overspray protective paint.
11.
Indicates direction of body cooling airflow.
12.
Mates with modified choke flange, UG-52 B/U (MIL-DTL-3922/59) (clearance instead of threaded holes.)
13.
W ith the tube mounted on the test fixture and with the specified air pressure applied so as to surround the entire input
terminal beyond the magnetron mounting plate, the entire magnetron and fixture are to be submerged in water. No bubbles
are allowed in a 1-minute interval. An equivalent test method to insure adequate air pressure containment is acceptable.
14.
W ith the tube output flange clamped against a modified choke flange (UG-52 B/U) and using a gasket in accordance with A-
A-55549, and with the specified air pressure applied to the interior of the waveguide, submerge entire tube and fixture in
water. No bubbles are allowed in a 1-minute interval. An equivalent test method to insure adequate air pressure containment
is acceptable.
15.
A plane passing through the axis of two threaded holes perpendicular to the face of the output flange shall be parallel to
planes "A" and "C" within .030 inch (0.76 mm).
16.
The frequency increases as the tuner input shaft is driven in the direction indicated by the arrow.
17.
The absence or presence of these holes does not impair serviceability of the tube.
18.
This dimension refers to radiator fin size only.
19.
Permanently attached protective closure for the exhaust tubulation of the tube will not restrict airflow nor impair serviceability
of the tube.
20.
The face of the waveguide flange shall be flat within .010 inch (0.25 mm) total indicator reading. The surface of this flange
shall be of such a quality that a hermetic type seal can be effected.
21.
Input connection mates with Jettron Products Inc., Hanover N. J. Connectors Catalog No. 90-006 and 90-030, or equivalent.
22.
Heater terminal and cathode terminal shall be concentric within .010 inch (0.25 mm).
23.
This diameter applies for length "AE" minus "AD".
9
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