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Old 17th November 2009, 03:31 PM   #1
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Default The soul of a new "electrostatic" machine

to borrow a phrase from Tracey Kidder -- wouldn't the Impasse Preamplifier with a bias supply work well to drive my electrostatic ear-speakers (Stax Lambda). I mentioned it to a friend at the NJAS meeting on Sunday.
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Old 17th November 2009, 10:25 PM   #2
DougL is offline DougL  United States
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I would think that the Impass was not designed for that service. I have not seen the Impass schematic, but I would think a Red Light with the headphone jacks on the primaries might be more like it.

The "nominal" sensitivity is measured with a 100 V pp signal. They are about 100pF.
Takes some real current to charge that capacitor. Blue Hawaii used EL34 and an 800V ps.

I would be interested in other responses.

Doug
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Old 18th November 2009, 01:22 PM   #3
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The Impasse is balanced out and I've gotten it to swing 60V RMS -- SY designed it to drive a pair of Pass F4 "current source" amps -- the input capacitance of which is a function of the 2SK170 and 2SJ74.

The Romans didn't have cricetae, they were native to the lands of the allemani.
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Old 18th November 2009, 04:22 PM   #4
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The Romans didn't have cricetae, they were native to the lands of the allemani.
LOL
Its worth a try at 60V RMS. Details of the Pin-out for the Stax connector can be found at Headwize. Let me know how it works out.
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Old 18th November 2009, 04:24 PM   #5
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Interesting idea; there's certainly symmetry. What's the load look like?
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Old 17th March 2010, 04:24 PM   #6
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Interesting idea; there's certainly symmetry. What's the load look like?
Cables and all it measures 168pF -- at least for my Stax Lambda's.
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