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Old 21st May 2004, 01:14 AM   #1
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Default Power follower 99c Vs Zen

I am very curious how does a power follower 99C sound compared with a Zen? Some may know what I am talking about.
The circuit looks very simple. There are some advantages I know:

1: Lower value capacitors
2: Lower output resistance which means good dampling factor.
3: Higher output power.

Is it reallyworthy to spend money to built it? I plan to use it with a BOZ.
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Old 25th May 2004, 09:51 PM   #2
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Sounds better.
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Old 25th May 2004, 11:59 PM   #3
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For those who have no clue what a "Power Follower 99C" is, could you please clue us in?
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Old 26th May 2004, 12:07 AM   #4
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Single Ended Pure Class A Power Follower Amplifier
Designed by: Andrea Ciuffoli.


LINKY


As to the question... which ZEN???

and... the only way would be to build and compare for yourself
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Old 26th May 2004, 08:35 PM   #5
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It's a fine amplifier with no voltage gain, if you can
deal with that.
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Old 27th May 2004, 07:37 AM   #6
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I've build Andrea's Follower some years ago - an original one and with some modifications (I've tried to use current source on mosfet and bipolar, I've tried to use bipolar power supply without the output capacitor, with DC-Servo), and I've tried original PassZen V3,V4, V3+tube input stage - and as for me (not only for me, but also for some of my friends) - the sound of Zen is better!

Thank You Nelson, for the genious design!

BTW, In my V3+tube there is some differencies from the original V3 shematic.
One of the differencies (according Fig.3 in Zen V3 pdf) - I take off C5 and put the upper pin of the R11 to the drain of the Q5 at first, then - to a separate lowpower supply (10 volts higher then Zen's main supply voltage)

The sound is better, as for me.
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Old 27th May 2004, 06:48 PM   #7
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I think that the sound of a follower is generally better,
as it has the 100% degenerative feedback and the
distortion and bandwidth are better. The damping factor
is a little higher on the follower, but I haven't noticed
much difference in bass control.
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Old 27th May 2004, 08:49 PM   #8
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I compared the follower (not Andrea's) and the ZEN (1st version) some 3 years ago. I would add to what Nelson said that the sound of follower did not depend that much on speaker used - probably because of the lower output impedance (0.3 Ohm approx) and the sound was more clean for complex music. But I have never heard ZEN V4.
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Old 27th May 2004, 09:21 PM   #9
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Yeah, the only issue is a preamp having enough gain and
voltage swing. It takes about 9 Vrms input to put 10
watts into an 8 ohm load.
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Old 28th May 2004, 06:33 AM   #10
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Exactly - needs Voltage Amplifying Stage
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