From: peterxpercival@hotmail.com   
      
   default wrote:   
   > On Fri, 30 Mar 2018 18:09:01 +0100, Peter Percival wrote:   
   >   
   >> I wish to experiment with valves (or tubes, if you prefer) and I shall   
   >> begin by building a power supply.  What voltages (at what currents)   
   >> should it supply?  Where may I find circuits?  Naturally, the devices   
   >> used should be easily obtainable.   
   >   
   > Naturally?  You best course of action is to move your birth-date back 100   
   > years.  Failing that, easily obtainable will be a stretch.   
   >   
   > The voltage, current, will be determined by what it will power.  Vacuum   
   > tube supplies, if variable generally had a variable transformer on the   
   > input to a line frequency power supply.  These days you'd be designing   
   > and building a switching supply, so I guess the next thing you should ask   
   > yourself is if the power supply to be versatile enough for a wide range   
   > of applications (variable voltage) or for a single fixed purpose?  And   
      
   Variable.   
      
   > does it have to be authentic (use "valves" itself?)   
      
   Preferably.   
      
   >   
   > To learn about tubes you may look for some vintage electronics company   
   > and start with a kit if you can find one, or find some old schematics and   
   > breadboard something.   
   >   
   > good luck   
   >   
      
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