MIL-DTL-15098E
3.4 Resistors. Unless otherwise specified (see 3.1), the current limiting resistors shall be
located externally. Unless otherwise specified (see 6.2), external resistors shall not be furnished
with the lamps.
3.5 Bulb shape, size, and finish.
3.5.1 Bulb shape. The bulb shape shall be as specified (see 3.1) and shall be designated
by letters as follows:
G - Globular
S - Straight side
T - Tubular
3.5.2 Bulb size. The bulb size shall be expressed by a number denoting the greatest
diameter in eighths of an inch. Example: a bulb size of 4-1/2 would indicate a diameter of
9/16 inch (4-1/2 x 1/8 = 9/2 x 1/8 = 9/16).
3.5.3 Bulb finish. Bulb finish for glow lamps shall be clear (colorless).
3.6 Lamp bases. Lamp bases shall be as specified (see 3.1) and shall be identified by the
following symbols:
M
-
Medium screw
CS
-
Candelabra screw
DCB
-
Double contact bayonet candelabra
DCBS
-
Double contact bayonet skirted
MB
-
Single contact miniature bayonet
SMF
-
Single contact midget flange
NB
-
Unbased wire leads treated to meet solderability requirements
3.7 Electrode shapes. Electrode shapes shall be as specified (see 3.1) and shall be
identified by the following symbols:
P2
-
Split disk
P3
-
Split hemispherical plates
P4
-
Parallel disks
PW5
-
Cylinder and helical electrode
PW27
-
Wire ring, flat plate
W11
-
Parallel posts
3.8 Solderability of wire terminals. When tested in accordance with 4.6.2, the dipped
surfaces of the type NB unbased wire leads shall be at least 95 percent covered with a new,
smooth, solder coating. The remaining 5 percent of the lead surface shall show only small
pinholes or rough spots, and these deficiencies shall not be concentrated in one area. Bare base
metal and areas where the solder dip failed to cover the original coating are indications of poor
solderability, and shall be cause for rejection. In case of dispute, the percent of coverage with
3
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