Hallicrafters FPM-200

Power Supply and Fan View

A better view of the power-supply power-transistors and fan looking down from the top. The transistors are for the DC-DC Converters square-wave oscillators, low voltage regulator feedback and pass and relay drivers. Notice the temperature switch in the middle row on the far right. If the transistor heatsink becomes to hot this switch will open a power relay and shutdown the transmitter.