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Old 23rd August 2009, 08:56 PM   #11
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Hours later, this one just isn't explaining itself to me.
I don't even know where to begin? Differential input?
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Old 23rd August 2009, 09:22 PM   #12
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Quote:
Originally Posted by atiq19 View Post
Wave,

what is a counter modulated CS? Could i use Nelson Pass over active CS?
I don't know, ask Nelson...
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Old 23rd August 2009, 09:23 PM   #13
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Originally Posted by kenpeter View Post
Hours later, this one just isn't explaining itself to me.
I don't even know where to begin? Differential input?
Better start from vacuumless triode output.
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Old 23rd August 2009, 09:50 PM   #14
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Default All that power... continuous into a single solid state triode Wavy?

Will it survive?

Have i miss something?.... 81 watts iddle?... one single transistor back metal plate transfering heat?

regards,

Carlos
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Old 23rd August 2009, 09:50 PM   #15
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Sure, it will survive depending on what kind of output devices you use, and size of heatsink!

One more version, no opamps.

Click the image to open in full size.
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Old 23rd August 2009, 10:03 PM   #16
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Originally Posted by Wavebourn View Post
It is a single ended vacuum-less triode amp. As drawn, you can get about 30W on 4 Ohm load, or 60W on 2 Ohm load. With no huge vacuum tubes, no B+ kilovolts, no filament heating. However, one of opamps must be capable of driving 160 Ohm load impedance, and a good heatsink will be needed. Source and emitter resistors mean you may parallel output devices spreading heat dissipation among them, so resistors must have higher resistance, number of devices times. Scott Wurcer gave me last year some samples of AD opamps that I may try in this amp.
I have gone for a SRPP tube front end with MOSFET output transistors.
It gives a valve sound with lots of power at a very reasonable price.
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Old 23rd August 2009, 10:37 PM   #17
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warning!!! Both versions need output coupling capacitor from amp out to speaker! They have 18v dc on outputs!
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Old 23rd August 2009, 10:46 PM   #18
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How about capless bipolar psu version?

I am looking for a anti clip ckt matching your buffer.
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Old 24th August 2009, 01:47 AM   #19
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Quote:
Originally Posted by atiq19 View Post
How about capless bipolar psu version?
For bipolar psu it will be more complex.

By the way, some gate stoppers will be needed, depending on MOSFETs used.
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Old 24th August 2009, 02:38 AM   #20
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Wavebourn,
tell me very confidentially, why extend the already huge and extremely harmful internal capacitances? What are they supposed to divide?
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