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7th March 2012, 01:34 PM  #11961 
diyAudio Member

Or add more output FETs although the added open loop ampl. raises the closed loop freq.
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SPU > two stage RIAA; Kaneda pre; F5 ; 300B PP no feedback; ESL 57 
7th March 2012, 01:35 PM  #11962 
diyAudio Member

. . . because they are in phase . .
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SPU > two stage RIAA; Kaneda pre; F5 ; 300B PP no feedback; ESL 57 
7th March 2012, 02:17 PM  #11963 
diyAudio Member

In phase as : he ran out of coffee beans and brains.
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7th March 2012, 05:36 PM  #11964 
diyAudio Member
Join Date: Apr 2003
Location: MA

Does anyone know if there are current plans to make an F5 board with a P3 pot on it?

7th March 2012, 06:38 PM  #11965  
diyAudio Member
Join Date: May 2003
Location: Chicago

Quote:
It sounds like only the active devices contribute to the distortion of the amp. Are there other jfet/mosfets that we might want to consider for the F5 that might not have perviously been considered? 

7th March 2012, 07:26 PM  #11966 
diyAudio Member
Join Date: Apr 2003
Location: MA


7th March 2012, 07:29 PM  #11967  
diyAudio Member
Join Date: May 2008

Quote:
So the transfer characteristic is not a straight line but curved. Last edited by bobodioulasso; 7th March 2012 at 07:34 PM. 

8th March 2012, 12:06 AM  #11968  
diyAudio Member
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys

Quote:
P(x) = sum(i, c[i]*x^i) The output from pair of amplifier chains with feedback is then: Vout = P1((1a1*Gain)*Vin  Vt1)  P2((1a2*Gain)*Vin  Vt2) The harmonic analysis in now done in the Fourier domain. For a given input Vin(f) at frequency f, the output response at frequency i*f is c[i]*Vin(f). This approach allows the use of complex coefficients, representing phase information (and capacitors and inductors). I haven't completed the details, but I expect the response for ith harmonic something like: Vin^i * (c1[i]*((1a1*Gain)) + (1)^i * c2[i]((1a2*Gain)) Another interesting discovery: Source resistor degeneration is known to be a type of local negative feedback. I have equations that show that source degeneration introduces higher order harmonic distortions in proportion to the amount of local feedback. This suggests higher harmonics might be reduced by reducing source degeneration. Unfortunately, that increases the openloop gain, which increases either the amplifier Gain or the global feedback. 

8th March 2012, 03:30 AM  #11969  
diyAudio Member
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys

Start an F5 theory thread?
Quote:
All of you who are interested in circuit theory as applied to the F5 (and related amplifiers) I suggest we start a new thread. I am very interested in thoroughly understanding why the F5 can be adjusted to work so well. 

8th March 2012, 08:30 AM  #11970 
diyAudio Member

You need equations for that ?
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