MIL-PRF-1/1640E
NOTES - Continued.
8.
WARNING: Maintain a minimum clearance of 4 inches between magnet and magnetic materials (magnets,
steel tools, plates etc.).
9.
Protective closure. Shall be removed before the TUT is used, and attached when the tube is not in use.
10.
The inner laminations of the cooling fins shall not be painted. However, there may be an overspray of the
protective paint.
11.
Indicates direction of body cooling airflow.
12.
Mates with modified waveguide RG-52/U in accordance with MIL-DTL-85/1. (Clearance instead of threaded
holes.)
13.
With the TUT mounted on the test fixture and with the specified air pressure applied so as to surround the
entire input terminal beyond the TUT mounting plate, the entire TUT and fixture are to be submerged in water.
No bubbles are allowed in a 1-minute interval.
14.
With the TUT output flange clamped against a modified choke flange, UG-52B/U, in accordance with MIL-DTL-
3922/59, and using a gasket, A-A-55549, and with the air pressure specified herein applied to the interior of
the waveguide, submerge entire assembly in water. No bubbles will be permitted in a 1-minute interval.
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 `B' within .030 inch.
16.
The frequency increases as the tuner knob is driven in a counterclockwise direction.
17.
Dimensions without tolerances are for information only and are not required for inspection purposes.
18.
This dimension refers to radiator fin size only.
19.
Rectangular opening to be centered within .005 inch with respect to the axis of the four threaded holes.
20.
Permanently attached protective closure for the exhaust tubulation of the TUT shall not restrict airflow nor
impair serviceability of the TUT.
21.
The face of the waveguide shall be flat within .010 inch total indicator reading. The surface of this flange shall
be of such a quality that a hermetic type seal can be effected. See note 14.
22.
Heater terminal and cathode terminal shall be concentric within .010 inch.
23.
This diameter applies for length AE.
24.
Tuner dial lock.
25.
This identifies a North seeking pole. This may be tested by observing which compass needle points to the
geographic South. The same compass needle will point toward the TUT North seeking pole when it is brought
near the input stem of the TUT. Care should be taken to insure that the TUT field does not reverse the polarity
of the compass.
FIGURE 1. Outline drawing of electron tube type 8855 - Continued.
11
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