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Build me a ss direct drive ESL amp, please
Build me a ss direct drive ESL amp, please
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Old 27th October 2017, 08:47 AM   #11
juma is offline juma  Germany
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Quote:
Originally Posted by Elvee View Post
...The concept can be made to work...
Or you can Circlo this guy:
http://ixapps.ixys.com/DataSheet/DS1...IXTL2N450).pdf
or some of his buddies:
4500 V Power MOSFETs - IXYS | DigiKey
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Old 27th October 2017, 06:06 PM   #12
Discopete is offline Discopete  Canada
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Build me a ss direct drive ESL amp, please
Now we're makin' headway for Discopete's sake!
Okay carry on.
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Old 27th October 2017, 07:58 PM   #13
DaveG is offline DaveG  United States
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Hi,

I have several Acoustat models and also the servo amps. The servo amps do sound better.

But there is also quite a difference between the DD amps and transformers and it is probably not the high voltage tube output stage making all the difference.

The DD amps have 2 adjustable EQ's, HF balance and the wall effect and I can't believe that the signal from 2 overlapping range transformers blended together would have exactly the same EQ curve as the amp. In the upper bass/lower mid range just a slight hump or dip could easily appear to add or mask some detail.

I never measured the signal at the speaker terminals but that might give some insight to the sound differences.


Dave
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Old 27th October 2017, 08:23 PM   #14
Discopete is offline Discopete  Canada
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Build me a ss direct drive ESL amp, please
Aren't you even a little curious how they would sound with no interface? A membrane with the equivalent mass of the air on either side of it has to be the ultimate arbiter, no? How else will we finally know?
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Old 27th October 2017, 08:32 PM   #15
woody is offline woody
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Do you know what the output voltage was for the Acoustat otl amp ?
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Old 27th October 2017, 08:45 PM   #16
Discopete is offline Discopete  Canada
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Build me a ss direct drive ESL amp, please
Around 4.5kv
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Old 27th October 2017, 08:52 PM   #17
xrk971 is online now xrk971  United States
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Build me a ss direct drive ESL amp, please
What you are asking for is not trivial. A commercial linear 5kV amp for electrostatic drive of instruments etc is quite pricey.

TREK Model PD06087 High-Voltage Power Amplifier

Since current is low, you might consider a simple
SE Class A device with as few transistors as possible and capacitive output coupling. I am thinking a HV mosfet linked earlier might work very well. Of course it needs a HV driver circuit.
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Old 27th October 2017, 09:18 PM   #18
Discopete is offline Discopete  Canada
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Build me a ss direct drive ESL amp, please
Don't know anywhere near enough to determine audio suitability of such a piece but your second option would seem workable here. Again, I'm puzzled at the lack of interest especially by the low distortion is everything ss guys.
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Old 27th October 2017, 09:24 PM   #19
Calvin is offline Calvin  Germany
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Hi,

don't believe that You can get away with just a couple of mA to drive a big panel.
Rather think in several hundreds of mAs.
The more so, the more full power bandwidth You want to achieve.
Typically the so far known candidates don't achieve more than ~5kHz.
The esl is also a almost pure complex load, demanding mostly reactive current.
Then account for the low efficiency of max. 12.5% or 25% (depending on anode load) of a SE class A.
Modulated current sources as anode load (making it a SEPP circuit) could achieve higher efficiency (50% in theory) but can be difficult to stabilize with a complex load.
I don't think, that it is as easy as Juma claims to build a esl dd amp.

jauu
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Old 27th October 2017, 09:36 PM   #20
DaveG is offline DaveG  United States
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"Aren't you even a little curious how they would sound with no interface?"

I am not sure what this means?

I do have the high voltage DD amps and also the transformer interfaces. What does "no interface" mean

Dave

Last edited by DaveG; 27th October 2017 at 09:39 PM.
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