MIL-DTL-75K
3.2.4.1 Packaging group 1 (see 1.2.1). Except as specified herein, receiving tubes and other
miscellaneous small electron tubes shall be individually unit packed in accordance with physical and
mechanical protection of MIL-STD-2073-1. Those that are tunable or adjustable or with silver plated
contacts or surfaces shall be unit packed in accordance with water vapor-proof protection of MIL-STD-
2073-1. Flexible cushioning material or die-cut devices shall be used to protect each tube having fragile
projections (not including sealed off tips and pins). The unit container for physical and mechanical
protection and the supplemental container for "water vapor-proof bag, sealed" shall conform to variety 2
of PPP-B-566 or PPP-B-676 for unit packs less than 5 by 5 by 12 inches (12.7 by 12.7 by 30.48
centimeters) or 300 cubic inches (4,916 cubic centimeters). Containers exceeding this size shall conform
to ASTM- D5118/D5118M for weather-resistant class.
3.2.4.2 Packaging group 4 (see 1.2.2). Cathode ray and related electron tube types shall be
individually unit packed in accordance with physical and mechanical protection methods of MIL-STD-
2073-1. Resilient pads, corner blocks, or die-cut devices conforming to ASTM-D4727/D4727M domestic
class shall be used to centrally position the tube within each unit pack in a manner to prevent physical
damage to the tube from shock and vibration and to prevent tip seals from coming in contact with the
container. The unit container shall conform to ASTM-D5118/D5118M for weather-resistant class.
3.2.4.3 Packaging group 9 (see 1.2.3). Except as specified herein, magnetron and other electron
tubes having permanent magnets shall be preserved in accordance with physical and mechanical
protection methods of MIL-STD-2073-1. Unless otherwise specified in the contract or purchase order
(see 6.2), those tubes that are tunable or adjustable or have silver plated contacts or surfaces shall be
preserved in accordance with "water vapor-proof bag, sealed" methods of MIL-STD-2073-1 with a
supplementary container. The distance between the outer magnetic surfaces and the outside of the unit
container shall be no less than the protective distance required in the precautionary handling or magnetic
isolation instruction in the MIL-PRF-1 detail specification or manufacturer's tube specification, as
applicable. When special instructions are not available, a minimum protective distance of 4 inches shall
be maintained. Cushioning, blocking, and bracing shall be as specified herein. The supplementary
container shall conform to ASTM-D5118/D5118M for weather-resistant class or, when these box
requirements are exceeded, to ASTM-D5168 for weather-resistant class. When specified in the contract
or purchase order (see 6.2) or by transportation rules and regulations, magnetic shielding shall be applied
in accordance with best manufacturing practices. When shielding is required, MIL-STD-2073-1 methods
for "sealed, rigid metal containers", using sealed metal drums which meet the best available shielding
requirements and the magnetic isolation distances specified herein, may be used in lieu of the
preservation and unit container requirements described above.
3.2.4.4 Packaging group 23 (see 1.2.4). Except as specified herein, electron tubes (except receiving,
magnetron, cathode ray, and related tube types) having a container size ranging from 6 by 6 by 15 inches
(15.2 by 15.2 by 38.1 centimeters) to 18 by 18 by 40 inches (45.7 by 45.7 by 101.6 centimeters) shall be
preserved in accordance with MIL-STD-2073-1 for physical and mechanical protection. Unless otherwise
specified in the contract or purchase order (see 6.2), electron tubes that are tunable or adjustable or have
silver plated contacts or surfaces shall be preserved in accordance with MIL-STD-2073-1 "water vapor-
proof bag, sealed" method with supplementary container, or with heat sealed bag container. Cushioning,
blocking, and bracing shall be as specified herein. The unit container shall conform to ASTM-D5118/
D5118M for weather-resistant class.
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