Elektor- MOSFET 'valvesound' amp opinion - toxicport.e - Propeller Head Plaza

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Elektor- MOSFET 'valvesound' amp opinion

Hi all
I think this forum is more applicable than the amplifier forum,where it seems like commercial amp discussion rather than technical points.
in a recent 'elektor'mag, a MOSFET valvesound amp has featured (could be nov2002 )
::Opinion wanted::
no valves here,all mosfet.(unlike the hybrids ive seen)
All this circuit is, is buffer,constant current source and Output mosfet in Class A ,(RC output+coupling cap)very simple NO NFB! -scary thought!
Thd=~4.3%
Fr=~83hz-115khz
D/f=0.21!
power output=~4w rms
s/n ratio=89db

Now, they say in the article they WANT to have a lack of damping on the loudspeaker to 'allow the full sound character to be revealed'( in similar words)
1. What affect would this current drive have on midwoofer and tweeter resonance exactly
2.Could this be a 'fun alternative' project for some one whos been brought up with cheap transistor chipamps and is trying to understand the valve pysche?
www.elektor-electronics.co.uk
Cheers!
mike.e
btw is NFB really causing high order harmonics that cant be linearised as easily as the lower order harmonics(+being alot more bad sounding)
OR is cause and effect wrt NFB and audio misunderstood by 80% of people.

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Topic - Elektor- MOSFET 'valvesound' amp opinion - toxicport.e 21:06:09 08/13/04 (15)

Re: Elektor- MOSFET 'valvesound' amp opinion - Steve Eddy 08:33:04 08/14/04 (13)

Spreads - toxicport.e 21:37:39 08/14/04 (12)

Re: Spreads - Steve Eddy 10:28:25 08/15/04 (11)

Re: Spreads - toxicport.e 16:55:54 08/15/04 (1)

Re: Spreads - Steve Eddy 18:04:47 08/15/04 (0)

Perhaps Class A - the way. - toxicport.e 16:23:48 08/15/04 (8)

Re: Perhaps Class A - the way. - Steve Eddy 18:40:20 08/15/04 (7)

SoZ - toxicport.e 20:00:46 08/17/04 (6)

Re: SoZ - Steve Eddy 23:44:34 08/17/04 (5)

active xover + SoZ - toxicport.e 17:40:49 08/18/04 (4)

Re: active xover + SoZ - Steve Eddy 21:31:36 08/19/04 (3)

Schematic - toxicport.e 18:10:52 08/22/04 (2)

Re: Schematic - Steve Eddy 18:58:47 08/22/04 (1)

conclude - toxicport.e 20:31:40 08/23/04 (0)

oops - toxicport.e 21:28:21 08/13/04 (0)

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