From: none@ntlworld.com   
      
   On 06/09/2010 23:18, François Yves Le Gal wrote:   
   > On Mon, 06 Sep 2010 08:26:45 +0100, Richard  wrote:   
   >> Any comments?   
   >   
   > Don't go above 450 or 500v using standard tube sockets unless you love   
   > fireworks.   
   >   
   > Download some manuals from Bama or similar sources and have a look at how   
   > Hicock, B&K, Eico and others measured leakage. IMO the B&K 650 (or above)   
   > and Eico 667 approaches are worth serious consideration.   
      
   Model 650 manual does not tell what the leakage tests are exactly.   
      
   Eico manual on page 10 (as per print on manual) shows some leakage   
   tests. It seems that leakage tests with this tester is simply in the   
   main, to test the electrode in question, against all the other   
   electrodes as per the diagrams.   
      
   c to heater (all others strapped together)   
      
   g1 to all   
      
   g2 to all   
      
   a to all   
      
   Is this satisfactory?   
      
   As to voltages, yes, no need to test at maximum voltages as per KT88   
   data sheet.   
      
   As to a leakage tester, I'm mulling the idea making a motor-driven one   
   using an Evershed and Vignoles Megger:   
      
   http://www.richardsradios.co.uk/megger.html   
      
   That will give me an instrument with a continuous test voltage range or   
   whatever steps I choose. From about 100V right up to about 600V.  I just   
   need a geared dc motor.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)