From: none@ntlworld.com   
      
   On 02/09/2010 23:14, François Yves Le Gal wrote:   
   > On Wed, 01 Sep 2010 19:44:29 +0100, Richard  wrote:   
   >   
   >> What will an audiophile like to know so he can have a good idea what he   
   >> or she would be buying? I want to describe the items so a buyer knows   
   >> the state of the tubes.   
   >   
   > Full test :   
   > Shorts (none whatsoever), gas, grid emission, leakage (at least 500K and   
   > preferably more than 2M between all elements).   
   > Transconductance and current (nominal is 11.5 mA/V and 140 mA @ 250V platye   
   > and -15V grid), another set of measurements @500V, a must with big bottles.   
   > End of life tests, same as above but with reduced heater voltage (6.3V   
   > nominal, 5.5V or so for EOL), transconductance and current should be at   
   > least 95% of nominal.   
   >   
   > Plus a full description. Add some nice hi rez pics showing the tubes as well   
   > as close-ups of the getters.   
   >   
      
   These tubes have one getter, at the top.   
      
   How metallic-looking should the getter flash be? Does the flashing start   
   out metallic then get less metallic-looking?   
      
   Can you test for "softness"?   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)