[AMRadio] Tube ID

Jim Wilhite w5jo at brightok.net
Sat Feb 22 17:42:28 EST 2014

I have a voltage regulator that is not marked except for the following: 816B997.  In circuit it glows bright orange.  

My memory fails me at the moment, is it an OA2?  It is a 7 pin miniature tube.  

The OB2 glows a purple color but I forget what color the OA2 glows, or for that matter what this tube may be if not an OA2.


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