> I am amazed that flux was enough to cause a problem like that for you, but I 
> will bear it in mind if I make any more.

I'm not surprised.  Just a few hundred microamps is enough for visible glow, 
and those transistors can have current gain in the hundreds.  Most flux is 
hygroscopic, so it pulls
moisture out of the air, and then the residual salts make it conductive.

- John

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