a simple amplifier to build?

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lineup

lineup

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Joined 2005
testarossa2k said:
I have very little experience and I would like to build a power amp to use with my preamp. I don't need tons of watt, but enough to get "live sound" without distortion from my speaker wich have 96db.
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Click to expand...


Nelson Pass F1, F2
are amplifiers designed especially for Loudspeakers with a bit higher efficiency.
96dB SPL would be a perfect match.

FirstWatt amps do not have plenty of watt.
But those few watts they have are very high quality = Class A.
This is why Mr. Pass has called this project for First Watt
and the website is www.firstwatt.com

It is a later construction of The Master Pass, only a couple of years since and still under some development.
He has recently given away his F2 schematics
and some people are trying to build copy of these interesting amplifiers.


If you go for this, FirstWatt F1 or F2, you would have good back up from other Nelson Pass builders,
right now working at such amplifier project.
Maybe even from Mister Pass himself ...
He is an amplifier designer/constructor in absolute World Class


Links, more info and schematics:
==============================================
www.firstwatt.com
http://www.firstwatt.com/downloads.htm
http://www.firstwatt.com/downloads/f1_srv_man.pdf
DIY - F2 Clone
F2 Initial Listening Impressions
6moons audio reviews: FirstWatt F2
www.passdiy.com - DIYsite of Nelson Pass
www.passlabs.com - Commercial Nelson Pass Amplifiers


Regards
lineup
Lineup Audio :cool:
http://lineup.awardspace.com/
 
lineup

lineup

Member
Joined 2005
6moons review of FirstWatt F2 www.6moons.com

.

A little story from the 6moons review of
the, at the time new, First Watt F2 amplifier by Pass
http://www.6moons.com/audioreviews/firstwatt2/f2.html
The new 5wpc Class A current-source F2 is a 2nd-order champ,
based closely on the original Zen amp
but without feedback.

This family resemblance occurred to a poster on the diyAudio forum.
"I assume that the F2 uses a lower supply voltage (between 25-30V) and a higher bias (3A perhaps?). It is yet unclear whether it uses a buffer or nor but I have some indications that it is built without a buffer, one Mosfet only. Now, it makes me wonder which device Nelson employed: IRFP044? Or maybe something else like a 2SK1529?"

If you don't already know it, Mr. Pass is highly supportive of DIYers.
For years, he has made available detailed schematics for his various Zen amps.
Besides being a creative outlet for unconventional amps the mainstream could never embrace, First Watt of course also has commercial aspects.
Its designer simply can't divulge all secrets before a particular incarnation has sold out (which, incidentally, is rapidly approaching for the F1, meaning service schematics will soon open the book on how to build your own F1).

So this is how Nelson replied to the above inquiry:
"24V; 2.7A; no buffer;
IRFP240 (gain) / IRFP9240 (ccs);
5 watts into 8 ohm;
15.5 dB gain;
-1 dB @ 100 KHz;
20 uV noise."

To which the poster retorted,
"Oh Nelson,
it seems you are describing a low-voltage original Zen with no FB."

And Nelson's crafty reply to that?
"Seems that way, doesn't it?"

.
Click to expand...
http://www.6moons.com/audioreviews/firstwatt2/f2.html

:D :D :clown: :D :D

Regards and laughter from
lineup
 
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