Differences Between Models - TM-11-6665-232-400007

TM 11-6665-232-40

b. IM-174B/PD. The IM-174B/PD uses one carbon-

regulator circuit which supplies the different

operating voltages formerly supplied by the six

zinc battery and its meterfase is illuminated from a

batteries. Both versions use either one of these methods

lamp which is behind the meterface. Internally it is

of providing illumination to the meterface for night

almost the same as the single battery type IM-174A/PD

use. This may be either of two types of an external

except for the meter lamp and switch in addition to

lamp and battery lighting hood or luminous paint for

some component changes in the electronic power

the meter markings.

supply regulator circuit.

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