75THs at work in a 30K-5

Hidden away inside the beautiful 30K-5 250 watt AM 2 channel transmitter, and nestled down safely in the modulator deck chassis, is a pair of rare 75THs providing the Class B P-P audio modulation. These are tubes are a joy of their own to watch operate and it is a shame that the 30K-5 did not get a “Modulator Window” like many of the other early Collins AM transmitters. Certainly, if Warren Bruene, the designer, had known how rare these tubes would become, he would have shown them off a bit more.