From: russell@fredswedlock.co.uk   
      
   On 18/10/2018 01:33, Phil Allison wrote:   
   > 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 appear to be "blessed" with the ceramic variant   
   >   
   >   
   >> 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.   
      
   ++	Not completely certain about that - at the time the solution seemed   
   to be to just double the power rating of the resistor - AT   
   >   
   >   
   >   
   > ...   Phil   
   >   
   >   
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