MIL-PRF-1/507H
NOTES - Continued.
13
Preproduction Sample Approval in lieu of Qualification: Approval of preproduction sample, based upon preproduction sample
inspection, shall replace Qualification requirements of MIL-PRF-1. Preproduction Sample tests, testing, sampling, and approval
criteria shall correspond directly with all pertinent requirements in the specification as normally applicable to qualification of product.
a. Unless otherwise specified in the bid request or contract, preproduction tests will be performed after award of contract, at the
manufacturer's plant. Approval of the preproduction sample is required prior to initial delivery of units on the contract. The
fabrication of production units, prior to approval of the preproduction sample, shall be at the manufacturer's risk. Unless
otherwise specified in the bid request or contract, the specimens shall become the property of the government and, upon
approval, shall serve as a reference standard for the contracting officer and government inspector.
b. Requests for information regarding preproduction testing and approval of the product(s) covered herein should be referred to the
Defense Supply Center Columbus, Code DSCC-VQE, P.O. Box 3990, Columbus, OH 43216-5000, vqe.chief@dla.mil.
c. No Qualified Products List (QPL) entry will be undertaken for the product(s) covered herein as approval of design and
performance of product will be based upon Preproduction Sample Approval.
d. In no manner shall the above requirements for Preproduction Sample Approval be construed as affecting requirements for
production acceptance inspection of the product(s) covered herein.
14
Tube-designation marking shall be in accordance with MIL-PRF-1. If any specification requirements waiver has been granted, the
product-identification marking shall consist of the tube type-number only.
15
Tube identification and tube serial number shall be marked in the most practical and most readily discernible location on the tube,
relative to its normal mounted position (see Note 9, above).
16
Unless otherwise specified in contract or order, each tube shall, as a minimum protection against moisture and moisture vapor be
sealed within a moisture-vaporproof barrier bag, or equivalent, normally acceptable under packaging requirements of MIL-DTL-75.
Also each electron tube shall be furnished with a dust cover for protection of the output connector.
17
The Acceptance Level for the combined defectives for attributes in Conformance Inspection, Part 1, utilizes an accept on zero
defect sampling plan in accordance with MIL-PRF-1, table III.
18
The tube shall be gasketed, and test made of the output assembly. The specified pressure shall be applied, and the tube immersed
in water. The tube shall be rejected if evidence of continuous formation of air bubbles exists.
19
The frequency shall be within the limits specified when measured under the stipulated temperature condition(s) and in accordance
with 4.9 (h) of MIL-STD-1311.
20
This test need be conducted under only one set of conditions within the limits presented for Oscillation(1) herein.
a. The characteristics of the applied pulse must be those that result in proper starting and oscillation. The rate of pulse voltage rise,
the percentage of pulse voltage ripple, and the rate of pulse voltage fall are among the more important considerations. Negative
post pulse voltage oscillation should be minimized to avoid leakage current and noise. Also, values of voltage and current fall
time, spike, ripple, inverse voltage and post voltage oscillations should be minimized.
b. In instances where the pulse shape departs appreciably from the rectangular, an equivalent rectangular pulse with minimum
departure areas shall be used for determination of pulse width and peak pulse current.
c. Any capacitance used in the viewing systems shall not exceed 6.0 pF.
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