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In Reply to: RE: Roger Modjeski and direct-drive ESL amplifier posted by Michael Samra on January 5, 2014 at 01:11:48:
The Bev voltages are known, because of the amplifier schematic. It's 3200V across from one stator to the other, but as you may know the Bev mylar does not require a polarizing external bias voltage. Most think that the mylar bias supply in the full-range Sound Labs puts at least 5-6kV voltage on the mylar, or maybe even slightly higher. This at least suggests that a DD amplifier for a full-range Sound Lab speaker will need to put a lot of voltage on the stators, also because of the reputedly wider than average space between stators and diaphragm. That is the problem, so far as building a direct-drive amplifier for the SL speakers goes. I am not at all equipped to say that 4000V (the spec for the RM dd amplifier) would be insufficient, without having tried it. Would love to try it.
Edits: 01/06/14
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