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10th October 2011, 08:01 PM  #1 
diyAudio Member
Join Date: Aug 2010

Radiotron question
Radiotron says the voltage gain of a power amplifier is 2.82*sqrt(Po*RL). Is this equation used all the time for power amp design, including pushpull?

10th October 2011, 08:37 PM  #2 
diyAudio Member

Which RDH? 4?
Which chapter, page, etc... 
10th October 2011, 08:44 PM  #3 
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Join Date: Aug 2010


10th October 2011, 08:47 PM  #4 
diyAudio Member
Join Date: May 2007

sqrt(Po*RL) is a voltage, not a gain. The 2.82 factor makes it a peakpeak voltage for a sine wave signal.

10th October 2011, 08:51 PM  #5 
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Join Date: Aug 2010


10th October 2011, 09:06 PM  #6 
diyAudio Member

This is the voltage gain of a triode output stage.
As DF96 pointed out, 2.82 is the factor from peak to RMS. The equation you gave is half the necessary information. It relates voltage gain M to power our when known along with the load resistance. The second formulae : M=(EmaxEmin)/2Ec1 defines the voltage gain as the ratio of the maximum output voltage divided by twice the input bias voltage on the grid, assuming an idealized condition where there is no grid current flowing at Vgk=0. From 1 & 2 you can equate output power to voltage gain if you know the load resistance by stating: 2.82 SQRT(PoRl)= M =(EmaxEmin)/2Ec1 Rearanging you get Po=((EmaxEmin)/2Ec1*2.82)^2)/Rl 
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