MIL-PRF-1/1717C
NOTES:
1. Anode rf contact surface and reference dimension for eccentricity measurements.
2. Grid rf contact surface and reference dimension for eccentricity measurements.
3. Heater contact surface and reference dimensions for eccentricity measurements.
4. Heater and cathode rf contact surface and reference dimensions for eccentricity measurements.
5. The total indicated runout of the anode and grid contact surface with respect to the cathode contact
surface shall not exceed .020 inch (0.51 mm.)
6. The total indicated runout of the cathode contact surface with respect to the heater contact surface shall
not exceed .012 inch (0.30 mm).
7. These dimensions shall be tested monthly when in continuous production, with zero failures allowable
during double sampling, with a minimum of four samples each.
In case of failure after double sampling, the failing dimension(s) shall become conformance inspection,
part 2, acceptance level 6.5, inspection level S3. After three consecutive successful submissions, the
sampling may revert to the double sampling plan.
8.
Silver plated 30 MSI minimum.
9.
Plating not required over radiator or handle support of copper, aluminum, or approved equivalent.
10.
This surface shall be used for measurement of anode shank temperature.
11.
Inner edge of heater and outer edge of cathode rf connection shall be free from burrs and sharp edges.
Insulated material between heater and heater-cathode shall be securely affixed.
12. Total indicated runout (T.I.R.) of contact surfaces shall be gauged from center line of reference and shall
be as follows. Note 7 shall apply.
TIR maximum
Reference
Contact surface
Anode
.020
Cathode
Grid
.020
Cathode
Heater
.012
Cathode
13. Diameters N, R, T, and U shall apply throughout entire contact areas as defined by dimensions AA, AB,
AC, and AD, respectively.
14. Dimensions in electrode contact areas table are for socket design purposes and are not intended for
Inspection purposes.
FIGURE 1. Outline drawing of electron tube type 8906 - Continued.
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