MIL-DTL-16225C
3.7.5 Volume control adjustment. The volume control shall be recessed so that the shaft shall be flush
with the enclosure surfaces. Provision shall be made for screwdriver adjustment of the volume control
through an opening in the loudspeaker housing. The volume control opening shall be so constructed as
to maintain the watertight security of the complete loudspeaker unit.
3.7.6 Finish. The loudspeaker shall be thoroughly cleaned and covered with a protective coating in
accordance with DOD-P-15328. This shall be followed by two coats of high quality semi-gloss alkyd
enamel. The color shall be light gray, and shall match the standard chip of formula III in accordance with
MIL-DTL-15090.
3.7.7 Terminals. All terminals necessary for connecting the audio source to the attenuator pad shall be
provided on the matching transformer. The transformer terminals shall be suitable for connecting type
M24643/23-01UN, LSTTSU-1½ inch cable conductors in accordance with MIL-DTL-24643/23. All screws
employed as parts of terminals for securing cable leads or other similar applications shall be of the
`captive' type. Staking or `upsetting' the ends of the threaded shanks of such screws shall be considered
as meeting these requirements.
3.7.8 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28, and shall have
the specified fit after plating or other coatings (see 3.2).
3.7.9 Solder. Solder shall be solid or rosin flux cored in accordance with composition Sn97Pb3 of J-
STD-004, J-STD-005, and J-STD-006.
3.7.9.1 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of loudspeaker components and solder shall not exceed 97 percent, by mass. Tin
shall be alloyed with a minimum of 3 percent lead, by mass (see 6.3).
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