The receiver will work from about 200-265 vdc. The actual dc output voltage of the power supply depends on the transformer secondary and the type of rectifier/filter used. Besides output voltage the transformer should be rated at about 150 ma output current.
The MKIII vibrator portion generated it's receiver voltage from the battery. The output voltage would change depending on battery charge.
The filaments are run from 12vdc even with the power supply switched to 24vdc.
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