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Old 4th April 2011, 10:24 AM   #191
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Default one that works (for 19 years)

D701/703 are real geraniums. In simulation I used scottky's. The sound is to die for (nikko alpha 220/230). ( Below )is the OPS , the VAS/input stage is the typical symasym/balanced topology , I have used a current sourced blameless instead with 10ma current. I still works ...

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Old 4th April 2011, 11:21 AM   #192
Elvee is offline Elvee  Belgium
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Originally Posted by kenpeter View Post
Now, thats more like B... 100mA crossing for the big transistors.

Late discovery: With Schottkys as shown, R1 R2 can be Muntz'd.
There is some improvement, now the Iq varies from ~25mA for no signal to ~1A at 25V^.
But that's not ideal yet.
And I fear the behavior at 20Hz will be worse.
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Old 4th April 2011, 08:56 PM   #193
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perhaps the servo methody from follow link can converted to the Vish topology:
N-Channel mosfet amplifier with servo bias
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Old 6th April 2013, 04:34 PM   #194
GEirin is offline GEirin  Argentina
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Hi Hahfran.
In your post 159 ".... R13, R15, C2 (D2?) are for fine tuning the harmonics spectrum. A truly wonderful descending spectrum was achieved."
There are other configurations of C,R, D. Phase Linear type and Arcam A60 type.
My questions:
You tried these other types? Or you proposal is the best configuration?
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Old 6th April 2013, 04:49 PM   #195
hahfran is offline hahfran  Germany
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That topology turned out to be rather sensitive to reactive loads. Not recommended.
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Old 6th April 2013, 07:40 PM   #196
GEirin is offline GEirin  Argentina
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You refer to the quasi topology is sensitive to reactive loads?
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