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In Reply to: Re: Much simpler answer posted by john curl on February 27, 2007 at 09:24:11:
I remember the Dayton-Wrights well having heard Dr. John W. Cooledge's pair back in '76. While his MK Is were a tad shy on the top, I was taken by their incredible coherency and low level resolution capabilities. Thirty years later, I'm still a 'stat freak.Indeed the later MK II / MK III's were a mixed bag (no pun intended - remember the outer diaphragm used to contain the SF2 gas?). More efficient, somewhat more reliable, but had that damn tweeter. I worked for a dealer who picked up the line at the time of the MK IIIs. He drove them first with a Dunlap-Clarke amp (Dan D'Agostino was the rep for both D-W and D-C at the time) and later with Nelson Pass' first effort, the 800A and finally a Stasis 2. Some folks disconnected the piezo. The store used an identical driver for use as a - burglar alarm!
Follow Ups:
SF6 gas :)
rw
Well, I am a chemist :)
it bears repeating. Dr. Cooledge not only wrote for TAS from day one, but he has been a member of the Atlanta Symphony Chorus for about thirty years as a baritone. One of the Dayton-Wright panels required replacement. He had to first cut the outer diaphragm to gain access to the interior where the panels are located. After replacing the panel and resealing the outer diaphragm, he had to replace the SF6 gas. So...As you know as a chemist, SF6 is heavier than air. Exactly the opposite of helium in that regard. You can put it in a cup where it remains colorless, but you can feel it. JWC inhaled a bit and then sung a line from an opera. It sounded like Lurch at the Met! That was hilarious. :)
Cool! I have heard that people have tried that before but personally I have never played with SF6. I am glad most electrostats don't need it. I guess the panels were moisture sensitive or did it simply reduce the chance of arcing?
Electrical insulator to prevent arcing.
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