tubes age 116
Subject: Re: [R-390] Tube testers and other babblings
Date: Sun, 18 Aug 2002 08:54:51 -0400
Your B&K tester is a good middle quality mutual conductance tester that should
serve you well. 99 out of 100 of your NOS tubes will be OK. Test them and if
they all test strong then don't worry about the testers calibration. Most testers I
have come across, the calibration has been pretty good. You don't have to go
crazy stocking up on tubes. Everyone seems to think that these darn things
burn out like mad when if fact if you put a fresh set in they would last for many
many years running 24/7. I have seen original tubes in 60 and 70 year old
radios that test just fine. And yes you can mix and match brands, and yes a tube
from the 1940's or even 1920's can be just fine.
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Subject: Re: [R-390] Tube testers and other babblings
Date: Sun, 18 Aug 2002 09:19:54 -0400
Hi About the only thing I can add to what's been said so far: Often I get tubes in
batches from very odd sources. Some better than others. This makes for some
fun when testing them since a whole batch may be bad. Each time this
happens I really don't know if it's the tester or the tubes. Here's a solution: Take
a couple of tubes that you have a lot of. Three is a nice number. Run them in
the radio for a few days to burn them in. Then measure them in the tube tester.
Record the readings and store them away. Some time in the next few years you
will pull out the tester, test a few tubes and then ask the question - are all of
these bad or is it the tester? Then you pull out the reference tubes and you have
an answer. Of course this only works on a tester like a TV-7 that has a meter
scale with numbers on it rather than a three zone good / who knows / bad
scale.
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Date: Sun, 18 Aug 2002 09:36:31 -0400
Subject: Re: [R-390] Tube testers and other babblings
You make a good point. I have been a fanatic about collecting spare tubes, so I
can have supply in depth. But as I think about it, I have replaced very few "bad"
tubes. Even transmitting tubes will last a very long time if you don't abuse
them.
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Date: Sun, 25 Aug 2002 15:24:35 -0400
Subject: [R-390] Tubes
I wonder if there is a book that will teach me enough about tubes to understand
them a little better. I have recently been buying tubes on line and some of the
descriptions are too much for me to understand. Such as " getters" and stuff
(14 pages)
(10 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
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