[Boatanchors] B&K 707 tube tester readings

[Dick KF4NS]

You know what Robert, that makes perfect sense. Guess I should have 
thought of that. Anything I test in the top section of the tester 
should always be read by the BAD-REJECT-GOOD markings. That is the 
auto test section for the most "common" tubes. The lower section 
requires that I set all the switches and is most likely supposed to be 
read using the uMho numeric scale.
Guess my logical reasoning portion of the old brain was disabled.
73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!


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Message: 7
Date: Tue, 23 Feb 2010 19:03:13 EST
From: WA5CAB at cs.com
Subject: Re: [Boatanchors] tube tester readings
To: boatanchors at mailman.qth.net
Message-ID: <1a1ef.62382d7a.38b5c6c1 at cs.com>
Content-Type: text/plain; charset="US-ASCII"

I think that the regular settings on charts or rolls on tube testers 
with a
GOOD/BAD scale are usually intended to cause a reading relative to the
GOOD/BAD markings, not the numbers.  If you think about it, you'll see 
that must
be the case.  Else if the Discard line happened to be at 50 on the 
numeric
scale, and the multiplier at 100 whether so marked or not, any tube 
with
less than 5000 uMhos would be rejected.  There go most triodes.  :-) 
Or if the
multiplier was at ten, almost any pentode without shorts or an open
filament would pass.  On a tube tester with both a GOOD/BAD scale and 
a numeric
scale, there should be somewhere in the TM instructions on how to set 
it to
read uMhos directly instead of GOOD/BAD.

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480


> ===================
>
> >Ok, this may seem like a duh to some, but on my B&K Dyna-jet tube
> >tester, the meter is scaled numerically from 1-120 but I have no 
> >idea
> >what the reference quantity means. The REPLACE-REJECT-GOOD markings
> >are not too much for my small brain. I know this is a mutual
> >conductance tester and I know what that means but have no idea how
> >this scale translates to that.
> >
> >Another unknown is regarding dual section tubes. The chart shows a
> >test 1 and test 2 but no reference in the manual as to which 
> >section
> >of the tube is which.
> >
> >Please enlighten me.
> >
> >Thanks and 73, Dick KF4NS
> >St Petersburg, FL 33714 USA
> >Keep The Glow!