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172 TEMPLIN August
not the optional phototube monitor assembly is used), and in the center, the adjustable taps for 105, 115, or 125 volts supply voltage. The power unit is mounted in a case the same size and of the same appearance as already described for the R A1282 amplifier. The weight is 38 pounds.
In order that the system may be operated entirely from 96-volt batteries, an auxiliary inverter unit has been developed. It supplies 60-cycle power at a nominal 115 volts to the RA-1284 power unit, the total battery drain under full load being approximately 2.3 amperes. This unit contains a vibrator and associated tapped autotransformer
Fig. 11— RA-1231 Type recorder.
which permits adjustment of output voltages to 115 volts ±5 per cent for battery-supply voltages in the range of 85 to 105 volts. The unit is compactly constructed for portable operation, its dimensions being approximately 8 X 9*/2 X 15!/2 inches and its weight 40 pounds.
RECORDER
The recording machine, previously described in the JOURNAL/ may be either the RA-1231 or RA-1231-A Type, depending on whether 35mm or 16-mm film is being used. The 35-mm model is shown in Figs. 11 and 12. A conversion-part set allows the recording machine to be modified at the studio or in the field so that it may be used interchangeably with the two widths of film. This recorder includes a sealed light valve and simplified modulator with prefocused lamp, producing a standard 100-mil variable-density track for 35-mm recording or standard 80-mil variable-density track for 16-mm recording.