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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, 10:45 PM   #21
Discopete is offline Discopete  Canada
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Huh? What do you do with your interfaces?
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Old 27th October 2017, 11:48 PM   #22
DaveG is offline DaveG  United States
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What I do is listen to a tube amp connected to the MK2 Transformer Interface in 1+1s and it sounds very good.

I also own and listen to the Acoustat Direct Drive amps that I run direct into (no transformer interface) the 1+1s and it sounds even better.

But I am not sure it is all just the OTL that makes the different sound since there is different equalization between the two drive methods.


Dave
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Old 28th October 2017, 12:10 AM   #23
PRR is offline PRR  United States
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_IF_ you can define the load, the thing practically builds itself. Do not know what you are asking.

I have done exactly this (attached) for an oscilloscope, except at 1/500th the power.
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File Type: gif ESL-SS-PRR.gif (32.8 KB, 308 views)
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Old 28th October 2017, 12:50 AM   #24
Discopete is offline Discopete  Canada
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Quote:
Originally Posted by DaveG View Post
What I do is listen to a tube amp connected to the MK2 Transformer Interface in 1+1s and it sounds very good.

I also own and listen to the Acoustat Direct Drive amps that I run direct into (no transformer interface) the 1+1s and it sounds even better.

But I am not sure it is all just the OTL that makes the different sound since there is different equalization between the two drive methods.


Dave
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Old 28th October 2017, 10:09 AM   #25
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by juma View Post
Wow! big boys indeed; no more need to cascade anything, a straight pair and that's it!
They would be ideally suited to a CircloMOS... Pete, you have your dd amp
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Old 28th October 2017, 01:41 PM   #26
Discopete is offline Discopete  Canada
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I love you guys
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Old 28th October 2017, 04:19 PM   #27
xrk971 is offline xrk971  United States
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Build me a ss direct drive ESL amp, please
It does indeed look like you can drive 4.5kV with a 10V swing on the gate of these MOSFETs.
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Old 29th October 2017, 05:51 PM   #28
Elvee is offline Elvee  Belgium
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Here is a CircloMOS adapted for extreme voltages:

Build me a ss direct drive ESL amp, please-uhvcirclo1-png

As the complete transistors models look awkward and somewhat incompatible with LTspice, I have used the internal MOS embedded inside the model.
This means no substrate diode, etc, but it gives a rough idea of what to expect.


The amplifier is capable of delivering 4kVpp, but only up to 10kHz, because the current necessary to charge and discharge the gates capacitance exceeds the driver's quiescent current beyond that.

Build me a ss direct drive ESL amp, please-uhvcirclo2-png

Reaching full power at 20kHz would be possible, but the dissipation in the driver and bias resistors R20 R21 would become really significant.

A workaround would be a floating buffer for M1, but it would require its own, floating supply, which is not simple considering the voltages and frequencies involved.

Anyway, for real musical signals, a full power bandwidth of 10kHz is more than sufficient.
The small signal bandwidth is large enough:

Build me a ss direct drive ESL amp, please-uhvcirclo3-png
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File Type: png UHVcirclo1.png (80.4 KB, 260 views)
File Type: png UHVcirclo2.png (80.2 KB, 258 views)
File Type: png UHVcirclo3.png (82.4 KB, 257 views)
Attached Files
File Type: asc UHVcircloMOS.asc (4.9 KB, 6 views)
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Old 29th October 2017, 07:13 PM   #29
padamiecki is offline padamiecki  Poland
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Old 29th October 2017, 07:18 PM   #30
userguide is offline userguide  Canada
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Build me a ss direct drive ESL amp, please
Default 560 farad !!!

Elvee, in your UHV circloMOS design C4 is really 560 Farad ??
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