Monday, January 18, 2021

SMALL BEAR: Germanium Transistor Test Method

Given I listed the RG Keen method, I thought I should add the Small Bear method as well.  It's a simpler test that some people prefer, and it's generally considered not as accurate as the RG Keen method but close enough for most purposes.

NOTE:

  • Be prepared to see the voltage fluctuate a lot while the transistor stabilises.  Don’t wait too long though, as you will be there forever - it may never stop!  
  • Handle the transistor as little as possible with your fingers, as the heat will transfer
  • Different environments will provide different results - this is very temperature dependant 
  • With all methods, the test results will vary, depending on the method used.  Why?  Without attempting to explain the math that I don't fully understand, hFE varies with the current applied to the base.  Different test methods and test equipment apply different currents, so results will differ.
Small Bear germanium transistor test method


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