[AMRadio] Tube ID

Rob Atkinson ranchorobbo at gmail.com
Sun Feb 23 08:02:40 EST 2014

Hi Jim,

I think I'd measure the voltage at that tube's socket and stick a
known VR tube in there for that voltage and see what happens.  But, my
knowledge is somewhat limited.  I guess a VR tube with neon in it
would glow orange.   5651 and 5651A are miniature neon VR tubes I
think.  90C1 or 85A2?



On Sat, Feb 22, 2014 at 4:42 PM, Jim Wilhite <w5jo at brightok.net> wrote:
> 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.
> Jim
> W5JO
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