From: jasen@xnet.co.nz   
      
   On 2018-04-02, George Herold  wrote:   
      
   > Tubes are expensive. (and fragile)   
   > How many $0.05 transistors does it take to replace a $50 tube?   
   >   
   > Beside PMT's are there any tubes being made these days?   
      
   magentrons.   
      
   Also RS-online seems to have about 12 different types of amplifier tube   
   in stock.   
      
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