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It's class AB from Nelson Pass

Wharfedale EVO 4.1 4.2 Speakers

baswamin

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Oh boy, I have not even finished F5 V2 and now this shows up. I dont think I have any space left at home.
 

longshanks

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Nelson Pass has been designing class AB amplifiers for many years.
 

kroyin

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Oct 12, 2011
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Actually the most logical thing to build after the V2T will be a 40-50 Watt Aleph X
(OM & Sachin ,I know I'm evil :))
We can reuse the chassis Om can design the 4 fet PCB with same mounting specs as F5T :)

Well I have built and heard the F5 and Aleph J & like most NP followers me thinks AJ sounds better :)
 
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omishra

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Oh boy, I have not even finished F5 V2 and now this shows up. I dont think I have any space left at home.

I forgot to see bold - I am not building it now. If I take another amp job soon after F5T then I would be chased in woods.
 

anilva

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Nelson Pass has been designing class AB amplifiers for many years.

Why do you say that? He has always built class A Amps which work in Class AB after certain levels of power. His biasing has been in Class A. This is his first pure Class AB amp.
 
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longshanks

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Why do you say that? He has always built class A Amps which work in Class AB after certain levels of power.

I always thought an amplifier which works in class AB when it goes beyond its class A power region is supposed to be class AB amplifier and not class A amplifier, i could be wrong.

AFAIK, pass product catalog has always had the X series which are Class AB,XA series which are Class A up to 4 ohms loads, and the new XS series which they say is an improvement over XA.

For example lets say an amplifier works in Class A say till 25 watts but its rated output is 75 watts @ 8 ohm, when this amp is connected to a speaker the power delivery is very dynamic depending upon the speaker efficiency,the music being played and Impedance drop.Considering this fact these Class A design which switches to Class AB wont work in Class A most of the times unless it is a true class A design like the ones made by gryphon and a few other manufacturer where the power doubles in Class A up to .5 ohms.

Again i am not an expert, in fact i know nothing much about how these amplifiers work but this is what i understand from certain people and by reading,if there is a different explanation then do let me know and i shall learn.
 
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