Audiopax 88 Power Amp

[apassgear]

See this other link,

www.stereophile.com/showarchives.cgi?777:1

end of page 2.

[Tube_Dude]

But what do you suggest using? This is a serious question, one which has interested me for some time.

For instance the much forgoten interface intermodulation distortion:

The inverting amp is much more prone to that forme of dinamic distortion(Even in solid state amps)because the EMF can reach the preamp or the CD.

I have spent much time studing the speaker interface and his relation to sound quality!Is that interface that explain the dramatic diferences betwen amps!

But you don't need to belive in me ...try this:

In a valve amp suitch the ground reference of the output transformer for the amp became inverting...then conect the feedback resistor to the grid of the first tube.
After this conect another amp via a 8 oHms resistor to the output.Put same music or sinusoide in this second amp and put the volume control at a medium level.
Then you can see at the grid of the first tube the sinusoide or the music that the second amp is feeding.(see with a osciloscope).
That second amp simulate the EMF of the speaker.
Is obvius that that voltage that apears at the input grid will enter in the preamp or cd...even if the ouput impedance of the preamp is low,but the open loop impedance is not! So this parasitic voltage will be processed!

Better than listening to people...is to do some experiences!

So keep your soldering station...hot.

Jorge

[apassgear]

More insight to the design of a previous Audiopax model

www.soundstage.com/yfiles/yfiles200108.htm



Other links

www.audiopax.com
http://www.6moons.com/industryfeatur...o/eduardo.html
www.audiopax.co.uk