the correct dynamotor for the BC-348 is the DM-28 which operates on 24vdc to 28vdc input, originally supplied by the aircraft battery-charger system. The dynamotor provides an average of 220vdc output. It takes about 1.8A under full load to run the dynamotor. But the initial start current, that is, the current required to actually get the armature moving, is closer to 8A or 9A. This current is only required for an instant and as soon as the armature begins to move the current drops rapidly. Additionally, the tube heaters are run from the 28vdc buss and they add to the total current necessary to power-up the receiver. The DM-28 assembly consists of the dynamotor, the filter assembly, the terminal strip and the chassis.