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Spark Gap Duet....Listen to the Light !

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Uploaded on Jun 27, 2010

Well, perhaps not a duet and more like Screaming Meemie's. Mercury HID tubes moved to bench for further tests. Both Mercury lamps are wired in parallel. 40w 120v standard lamp is placed in series. Lab supply used is an EICO 1030, variable 0-400 150ma DC supply.
The 1P39 vacuum photo tube is connected to a small amplified speaker just out of view. Tones and 'hash' are heard being produced at an audio frequency rate & perhaps beyond. The low frequency 'hum' is produced by the overhead lights and picked up by the sensitve phototube.

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