On Tue, 15 Jan 2008 21:26:15 -0800, None wrote:

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

On my tube tester there are some settings on some tubes that'll cause a
short indication, but they're listed in the manual (and presumably you
don't do an emission test across those terminals).

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

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"Applied Control Theory for Embedded Systems" by Tim Wescott
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