From: pallison49@gmail.com   
      
   Abandoned Trolley wrote:   
      
   >   
   >   
   >   
   > Not sure ... I know that a lot of Fender guitar amps have their tubes   
   > mounted "upside down" - but the output pentodes are all fitted on   
   > ceramic bases.   
      
      
   ** Some use white ceramic sockets - but most use plastic or phenolic bases.   
      
      
   > I have noticed on certain other makes that the screen grid resistors   
   > unsolder themselves and fall off when they get very hot, although I   
   > don't suppose that was one of the design criteria.   
   >   
      
   ** Really has to be a faulty tube or a big problem in the biasing to make that   
   happen.   
      
      
      
   ...   Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)