MIL-PRF-1-1389 Electron Tube, Cathode Ray Type 10Anp7

Pages 1 - 2 - 3 - 4 - 5 - 6

MIL-PRF-1/1389F

TABLE I. Testing and inspection - Continued.

1/ ĆEc1 shall be not greater than the value of grid cutoff voltage (see method 5241).

2/ Cylinder shall be 4 inches (101.60 mm) long and .910 inch (23.11 mm) maximum inside diameter.

3/ The screen characteristics shall be measured with constant beam energy of 0.24 watt defocused to a spot approximately 0.25 cm in

diameter. The test conditions shall be anode voltage (relative to cathode) 9,000 volts and beam current 27 �A dc maximum. The

screen characteristics shall comply with the following minimum limits: cB5 = 480 cB; G5: 1 = 4.

4/ The distance between the center of the unfocused, undeflected spot at low intensity (Ec1 near cutoff) and the center of the image of

the masking aperture observed at high intensity of the unfocused, undeflected spot shall not exceed the limit specified herein. Ec1

shall not be held at zero for more than approximately 10 seconds to prevent damage to the screen.

5/ The activity responsible for the qualified products list is the Defense Supply Center Columbus, Code VQE, 3990 E. Broad Street,

Columbus, Ohio 43216-5000 and information pertaining to qualification of products may be obtained from that activity. Applications

for qualification tests shall be made in accordance with "Provisions Governing Qualifications SD-6". (Copies of "Provisions

Governing Qualification SD-6" may be obtained upon application to Standardization Document Order Desk, 700 Robbins Avenue,

Building 4D, Philadelphia, PA 19111-5094.)

6/ This test is to be performed at the conclusion of the holding period.

7/ The low-pressure test shall be made with maximum voltages applied, and pressure equivalent to 20,000 feet (348 mmHg).

Connections shall be made to the base pins in a manner that does not degrade the tube breakdown characteristics. Satisfactory

operation shall be the absence of arc-over and harmful corona.