From: pallison49@gmail.com   
      
   Big Bad Bob wrote:   
   >   
   >   
   > > ** FYI,  I have a prototype 2x EL84 output stage here that   
   > >  delivers over 50 watts with low THD and no overheating.   
   > >  The trick is to use a split supply of 325V and 650V for   
   > >  screens and plates respectively.   
   >   
   >   
   > probably works ok for hi-fi but I wonder how it would handle output tube   
   > overload distortion for a guitar amp...   
   >   
      
   ** Just fine, the European made amps that used a similar set up were   
   instrument amps. Clipping the output wave causes low plate dissipation but   
   high screen - keeping the screen voltage down helps a lot.   
      
      
   > I guess you could run clipped sine waves through it to find out.  I used   
   > to test power amplifiers under conditions like that by dunking a   
   > somewhat-high-wattage 8 ohm resistor (tied to speaker outputs) in a   
   > glass of water. It's funny to watch it boil the water just a bit...   
   >   
      
   ** I use a bucket of water with a pair of 100W, tubular ceramic, 8 ohm WW   
   resistors. A simple switch box allows 4, 8 and 16 ohm loads. Copes with 2kW   
   fine.   
      
   https://www.ebay.com/itm/8-ohm-100-Watts-Wirewound-Ceramic-Tube-   
   esistor-100W-/201153517823   
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)