MIL-PRF-1/1239F
NOTES:
1. Metric equivalents are given for general information only and are based upon 1.00 inch = 25.4 mm.
2. Areas between cooling fins, area between anode terminal and grid 2 terminal, and area between heater terminal
and heater-cathode terminal shall not be used for any purpose.
3. Maximum dimensions shall be determined by gauge No. 4 (see figure 2.)
4. With cylindrical surfaces of the anode terminal, screen grid terminal, control grid terminal, heater cathode terminal,
and heater terminal clean, smooth, and free of burrs, the tube shall enter the gauge No. 4 (see figure 2). Axes of
cylindrical holes H1 and H5 and axis of post P shall be concentric within .001 inch (0.03 mm). Seating shall be
determined by failure of gauge .125 inch (3.18 mm) wide and .010 inch (0.25 mm) thick to enter between heater
cathode terminal and bottom surface of hole H4. A slot in the gauge is provided to permit this measurement to be
made.
5. Minimum dimension shall be determined by gauge No. 4 (see figure 2).
6. This dimension to be inspected by inserting gauge .050 inch (1.27 mm) thick minimum between the two fins.
7. Dimension "N" applies to dimension "E" only.
8. Dimension "P" applies to dimension "G" only.
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Dimension "Q" applies to dimension "F" minus dimension "H" only.
10. Dimension "R" applies to dimension "H" only.
11. In area included between anode terminal and grid 2 terminal, no part of tube shall exceed dimension "P".
12. On any one tube, this dimension shall never be greater than "N".
13. On any one tube, this dimension shall never be greater than "P".
14. The acceptance level for all dimensions listed under conformance inspection, part 1, shall be 1.0, in accordance
with MIL-PRF-1, table III.
15. Dimensions shall be checked during the initial production and once each succeeding 12-calendar months in which
there is production. A regular double sampling plan shall be used, with the first three tubes with an acceptance
number of zero, and a second sample of three tubes with a combined acceptance number of one. In the event of
failure, the test will be made as a part of conformance inspection, part 2, with an acceptance level of 6.5, in
accordance with MIL-PRF-1, table III. The regular "12-calendar month" double sampling plan shall be reinstated
after three consecutive samples have been accepted.
FIGURE 1. Outline drawing of electron tube type 6816 and 6884 - Continued.
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