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Old 30th July 2009, 06:25 AM   #81
diyAudio Member
Join Date: Sep 2005
Hello revintage

The schematic you made sim. on it is biased in Class A or A/B .
Interesting , not many amplifiers in the forum or even the market uses real lateral mosfet in SE mode like 2SK1058 .
Do you think these amp would work properly .
I still didn't finished yet the original Widowmaker amplifier but soon I'll and I test it .
I was sick unfortunately .
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Old 30th July 2009, 10:26 AM   #82
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
Hi Gab,
have another look at the schematic.
The lower FET is set up as a constant current sink (CCS).
The upper FET is set up as a single ended source follower (common drain).
It cannot be anything else but ClassA.
regards Andrew T.
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Old 30th July 2009, 06:23 PM   #83
diyAudio Member
Join Date: Sep 2005

Thanks AndrewT .
Mostly I ask that question because I thought someone will give a advise about the size of the heatsink required and if these schematic would work in real life. OK they did some sim test but usually that not 100% proof the circuit will work if someone give a try .
Thank any way .

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