I just got my B&K 747 tube tester back from professional
calibration and service at CTech Electronics, and I'm now very
careful in how I use it, so as not to damage anything like I
aparently did before.

My question is this: I now hit the 'shorts' button first thing
after the filament is lit. If it lights, I pull the tube and do NOT
hit the 'test' button.

But is there ever a circumstance where a 'good' tube will cause
the shorts light to light? I ask because I had some 6146s a while
ago that would light the 'shorts' light up, but tested far into the
'good' range scale.

Any input would be helpful,

Thanks

Dave WB7AWK