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RE: Infinity ServoStatik - high end stopped working on one panel

Posted by triamp on March 9, 2023 at 03:47:00:
Play something like FM radio interstation hiss- some broadband noise. Put your ear next to the front of each of the blue tweeters. If they ALL sound low in output, the problem is likely the high voltage "bias" supply is no longer producing the voltage that it should. Note that this is a charging voltage for an electrostatic panel and not a high voltage supply like your have for a neon lamp or a transmitter - this is a very low current supply since all it has to do is supply charge to the tweeters, not current. Therefore you need a somewhat special meter to measure the voltage, a regular DVM won't work. There are ways to measure this voltage; consult one of the electrostatic speaker forums for advice. My point is, don't just stick a DVM on the supply and expect to get any kind of accurate measurement. But once you have a method of measuring the high voltage bias (special meter or special setup for a regular meter) you'll want to compare the GOOD speaker's bias voltage to the bad speakers. As I recall the RTR tweeters use about 7,000 to 8,500 volts - something like that. Note that even though the current is quite low, 8 thousand volts can still knock you on your ass, so unless you know what you are doing, it's not advisable to monkey around in there. I'll bet that the diodes in the ladder voltage multiplier have broken down. Find someone who can sell you a rebuilt high voltage multiplier board if you find that the bias voltage on the "no highs" panel is not up to snuff. The parts used on these voltage multiplier boards are not exotic and are readily available, so I would guess that you would be able to find some electrostatic speaker guy someplace who can either rebuild yours or sell you a rebuilt one.

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