From: cd6699@notformail.com   
      
   Gentlemen,   
      
   I have an early AVO valve tester (twin panel type, Mk1 or Mk2) which   
   I'm trying to get fully working. Anyway, I have a problem with it   
   which I've never encountered before. I set the panels up to test a   
   valve, set the anode and heater voltages etc, the valves are glowing   
   just like they should, but when I apply the prods of a DVM across the   
   heater pins to check if they're correct WRT the switch setting, that   
   tiny extra load completely collapses the supply to the heaters! The   
   meter reads 0V (or close enough) and the heater glow dims to nothing.   
   Any idea WTF's going on here?   
      
   Cheers,   
      
   CD   
      
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