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Old 13th October 2012, 02:38 PM   #1
Stee is offline Stee  Italy
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Default MYBEST5 Jfet CFP amplifier

another simple idea for natural sound
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Old 13th October 2012, 03:13 PM   #2
Boscoe is offline Boscoe  United Kingdom
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What makes this amp have natural sound?
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Old 13th October 2012, 09:07 PM   #3
Bensen is offline Bensen  Belgium
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Isn't this VFB instead of CFB?

Have you heard amplifiers with this topo, in order to tell that this one is good sounding.

My next amp will very probably have a comparable topo.
See the circuit and FFT analysis.
==> FFT is done with 3V amplitude at the output
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Old 13th October 2012, 09:52 PM   #4
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I think he's referring to the output CFP (complementary feedback pair) transistor(s).

Thanks
-Antonio
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Old 13th October 2012, 11:37 PM   #5
Jay is offline Jay  Indonesia
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What does it mean by "Best5"? Are there 4 other better CFP amps?

My best CFP is an SSA (Not very fast tho).

Bensen,

Can you show an FFT of your amp with 5m of simulation (.tran 5m) in Hann windowing?
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Old 14th October 2012, 11:19 AM   #6
Bensen is offline Bensen  Belgium
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Hi Jay,


I always use the blackman, what specific information are you getting out of the Hann window?
See the attachement, again simulated with 0.1V input.


Greetz
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Last edited by Bensen; 14th October 2012 at 11:23 AM.
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Old 14th October 2012, 01:11 PM   #7
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by Bensen View Post
Hi Jay,
I always use the blackman, what specific information are you getting out of the Hann window?
See the attachement, again simulated with 0.1V input.
Greetz
Simulation is just simulation. What important is subjective performance and consistency between pictured performance and real life performance. If you can not differentiate 2 amps by looking at their FFTs, then showing FFTs has no meaning, right?

I think something is wrong with your circuit (may be from insufficient drive for the mosfet VAS). And there is also masking by noise floor.

But anyway, that's just my opinion.
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Old 14th October 2012, 03:46 PM   #8
Stee is offline Stee  Italy
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Default Yes CFP means natural sound

but also the esclusive VLL system on VAS
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Old 14th October 2012, 08:29 PM   #9
Jay is offline Jay  Indonesia
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Is it a VAS?
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Old 15th October 2012, 02:04 PM   #10
Stee is offline Stee  Italy
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sure
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