HI-Fi Amplifier

GOALS

  • 100 Watts x 2-Channels (Stereo)
  • Transformer Coupled Speaker Outputs
  • Class AB (Push-Pull) Configutaion
  • MOSFET Output Drivers running in “Triode” Mode (Trying to get that “tube” sound.)
  • Capable of Delivering the Full 100 Watts to Both Channels Full Time
  • Selectable Input Sensitivity (2V Unbalanced/10V Balanced)
  • Selectable 110V/220V Wall Voltage

THE WHY

I am in the market for a new integrated receiver.  I still love the sound of my Yamaha RXV-2400, it’s just missing some features that are now making it inconvenient to use.  So I thought, I’ll just buy a newer Yamaha unit.  I liked the old one, so a new one must be even better.  Boy I was met with massive disappointment.  The new receiver did not sound anywhere near as good as my current rig.  The amplifier’s frequency range was not as wide as my RX-V2400 and it seemed to “run out of breath” if you even tried to turn it up a little.  That last part I attribute to the fact that, while on paper, the new unit may have the same specs as my old one, but it doesn’t have the same build.  For instance, the power transformer is probably one-quarter the size of my old unit.  (Still and E-Core type, so were not getting any size efficiency from a toroidal core.)  I’m sorry, but you need sufficient iron to make good power and this new unit definitely falls short.  I then started to look at other common brands but found that may of them are going just a little to cheap on components which is sacrificing sound quality.  And the only well build, good sounding units out there are out of my price range.

So here we are at another project.  I believe that is is possible to construct a high quality Hi-Fi amplifier for about one-quarter the price of a modern top quality amplifier.  I am fully aware that I will probably not achieve the performance and sonic quality of, let’s say, a McIntosh amp.  But I’m sure going to try.