From: pfjw@aol.com   
      
   On Thursday, September 10, 2015 at 1:11:15 PM UTC-4, Big Bad Bob wrote:   
      
   > I tried one type of regulator (cheap design), which helps but not   
   > enough.  An RC filter isn't enough.  You need a stable voltage reference   
   > and a diff amp to control the regulator.  3 transistors, and a handful   
   > of other parts.  Now I just need to order the parts, to prove the concept.   
      
   If you are confining your efforts to instrument amps, and have what I might   
   only describe as the "typical" attitude towards fidelity that goes with   
   instrument amps, a switching supply might be perfectly acceptable - just   
   another 'effect' device. Given    
   the fascination with leaky "black cat" or "bumblebee" capacitors in this   
   aspect of the hobby, nothing surprises me.    
      
   But, if you are looking at audio amps (tube), then a switching supply will   
   take more heroics to make acceptable than a conventional supply. To that end,   
   if you really want portability, get Solid State. Solves several issues   
   (weight, portability and cost)    
   quite nicely with results almost guaranteed to be better than a tube amp with   
   a switching supply.    
      
   Peter Wieck   
   Melrose Park, PA   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)