
Home  Forums  Rules  Articles  diyAudio Store  Gallery  Wiki  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum 

Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving 

Thread Tools  Search this Thread 
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
Join Date: Aug 2009
Location: Johnson City, TN

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


10th October 2011, 09:06 PM  #6 
diyAudio Member
Join Date: Aug 2009
Location: Johnson City, TN

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 
Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Radiotron for sale  jlsem  Swap Meet  8  12th June 2010 02:04 AM 
Radiotron  Keithj  Swap Meet  0  9th April 2007 05:55 AM 
Radiotron Designers Handbook  Frazzled  Tubes / Valves  15  26th March 2007 02:07 PM 
RCA Radiotron 45s  Miles Prower  Vendor's Bazaar  0  15th January 2007 10:30 PM 
Cunningham/Radiotron RCA 58  apassgear  Tubes / Valves  2  1st February 2003 01:03 AM 
New To Site?  Need Help? 