push pull Vs single ended class A amp - Page 3 - diyAudio
 push pull Vs single ended class A amp
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 6th August 2008, 10:02 AM #21 diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders parallel output pairs 1pair using Re=0r11 gives 0.6W of power before entering ClassB. 2pair gives 2.5W while still in the ClassA region. 3pair gives 5.5W in ClassA. 4pair gives 10W in ClassA. But, I prefer to increase output Re as the number of parallel pairs increases bring the ClassA limit back doown. __________________ regards Andrew T. Sent from my desktop computer using a keyboard
diyAudio Member

Join Date: Sep 2006
Re: parallel output pairs

Quote:
 Originally posted by AndrewT 2pair gives 2.5W while still in the ClassA region. 3pair gives 5.5W in ClassA. 4pair gives 10W in ClassA.
Are you shure, RMS power in 8 ohm?

 6th August 2008, 04:54 PM #23 diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders Vre=20mV, Ire=200mA, IpkclassA=400mA, PclassA=0.4^2*8/2=0.6W 2pair runs double the current and gives four times the ClassA power. 3pair runs triple the current and gives nine times the ClassA power. __________________ regards Andrew T. Sent from my desktop computer using a keyboard
diyAudio Member

Join Date: Sep 2006
Quote:
 Originally posted by AndrewT Vre=20mV, Ire=200mA, IpkclassA=400mA, PclassA=0.4^2*8/2=0.6W 2pair runs double the current and gives four times the ClassA power. 3pair runs triple the current and gives nine times the ClassA power.
P=I^2*R
P=Irms*Irms*R
Irms=Ipk/sqrt(2)
P=Ipk^2*R/2
Ipk=Ipp/2

Andrew, please make the math again.

 7th August 2008, 08:46 AM #25 diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders why? Your formulae agree with mine and on the 0.6W we agree as well. __________________ regards Andrew T. Sent from my desktop computer using a keyboard
 23rd August 2008, 04:31 PM #26 diyAudio Member   Join Date: Apr 2007 Is the difference between SS single ended and push pull similar to the difference between a tube single ended and pull ? Like an EL84 tube, music would sound different when used in an SET for 1.3w vs. a triode push pull model. That's for starters then you play in directly heated thoriated triodes like the 845 and such.

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