From: asdf@nospam.com   
      
   On Mon, 04 Dec 2017 22:21:32 -0500, default wrote:   
      
   > Are they still being manufactured?   
      
   I doubt so, they were expensive and had a very narrow market.   
      
   Some eastern EU users, mainly form Russia and Ukraine sell   
   cheap NOS USSR made germanium tunnel diodes on Ebay.   
   (example: https://www.ebay.com/itm/263344534127)   
   Anyway they can be simulated using available components;   
   a search for "lambda diode" or "negistor" on google images   
   will bring lots of examples.   
   I have used the lambda diode configuration in the past and   
   loved it for being so simple and practical: it used no   
   reactive parts other than those employed in the tuned circuit,   
   so that it would oscillate from audio to the UHF just by   
   using a different LC circuit. Making a great GDM out of   
   it was just a matter of adding a detector and a meter.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)