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Old 30th March 2012, 07:39 PM   #571
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Hello triode

Please after you tested let us know how it work out. Thank you
I prefer the sound of the Fet, many years I was interested on that schematic but not with those old V-Fet.
Also one day I will test the LeMostre mosfet version.
I made the PC boards but now I'm busy with other project.
I post the schematic here if someone interested........

Greetings Gabor
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Old 31st March 2012, 08:16 AM   #572
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Quote:
Originally Posted by gaborbela View Post
Hello triode

Please after you tested let us know how it work out. Thank you
I prefer the sound of the Fet, many years I was interested on that schematic but not with those old V-Fet.
Also one day I will test the LeMostre mosfet version.
I made the PC boards but now I'm busy with other project.
I post the schematic here if someone interested........

Greetings Gabor
That's a nice combination of Le Monstre and the Le Classe A variant of the Sony Farlington.
I plan to use HIT667, + HIT647 as drivers. That must be good enough for the input capacitance, there is no real current like with a BJT output.
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Old 31st March 2012, 10:48 AM   #573
AndrewT is offline AndrewT  Scotland
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post571.
the R9/R10 junction connects to the feedback node.

Does it need to?

What does this extra connection achieve?
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Old 31st March 2012, 01:15 PM   #574
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Hello Andrew
Probably a mistake, I have to take a look at the orig LeMonstre.
I didn't designed these circuit or worked on it.
All do I made the PC boards ready.
Thanks one more time
Greetings Gabor
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Old 31st March 2012, 01:25 PM   #575
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Hello

Yes it look like a error in the circuit com pare to the orig Monster!
Thanks one more time.
Now I have to pay att. on the PC board to...
The lay out need to be rescale when you printed out!

Greetings Gabor
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Old 31st March 2012, 01:31 PM   #576
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Hello
I forget to attach.
Greetings
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Old 31st March 2012, 06:51 PM   #577
AndrewT is offline AndrewT  Scotland
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I see the original connects the same two resistors to Audio Ground. Again the same question: does it need to?
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Old 31st March 2012, 07:15 PM   #578
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Hello
Good question.I built that way a couple times, to be honest I never kept the Monstre more than couple month in my system.
I do not like that sound, to precise (almost clinical) with good CD sound OK but most of the time the sound is thin, not my cup of tea.
Greetings Gabor
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Old 1st April 2012, 07:18 AM   #579
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In the original the cascode bias goes to ground.
With due attenuation of the feedback (220 ohms/10 ohms Le Monstre and maximum signal of 10 peak) this means that the Vds swings one volt underneath the cascode. That is OK.
With a higher voltage, the Vds starts to swing more. At a certain point (like in the F5 cascode!) there is 5 volts swing on the Vds - to much imho, the whole sense of the cascode disappears, except for the dissipation/heat.
  • (The sonic reason is that it decreases the capacitances of the input JFets and makes them more transparent)

So Gabor,
My reasoned suggestion: connect the bottom of the bias divider to the 10 ohms of the feedback.

[The all BJT Le Classe A don't have a cascode]
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Old 1st April 2012, 07:53 AM   #580
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Hello
So you say to use the connection at the mosfet version it was correct. Connect to the ground!? Like the schematic at the post 571?
Please advise if I understand it well. All do I want to go a bit higher PS voltage. About 17V rail voltage but I still do not think that extra 5V will do 5V swing.
Greetings Gabor
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