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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: RE: Not sure how that relates to posted by tomservo on March 28, 2024 at 15:41:08:
I can relate to electrostatics, in the 80's i made probably a dozen pairs of large panels and built a direct drive tube amplifier for some of them.
I met Jim Strickland in 1976 when he brought a pair of his Acoustat X with 3kV servo amps (using 6HB5 horizontal deflection tubes) to Atlanta for TAS reviewer JWC. There was a dealer there that evening as well and picked up the line immediately. I later worked for him and got mine. Challenge is delivering enough power that way. Those amps were good for about 100 watts each and used a modest TL072 opamp based input stage. Later versions moved to a dual transformer approach (to tame the impedance curve) using your choice of amp. The bias on my current SL stats is variable up to about 12kV depending upon humidity.
At 4 feet sitting on the floor the ESL63's were excellent but i wanted +10dB capacity and to go down to low bass when present.
Such exists today with enough diaphragm area using a scalable design like that of Dr. West. You can make them darn big if you want with controlled radiation. ;)
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