tubes age 65
2. Try all three of the 6AK6's in the V-504 socket, after warming each for two
minutes, check the carrier meter reading. The higher the reading the better the
tube. Use the best in V-504, second in V-603 aand third in V-604.
3. Again, with V-201 tube removed, the 6C4's can be tested for noise in the V-
202 position. use them in this order, quietest in V-202, second in V203 and
third in
V-204.
4. V-701 should be an example that has little drift.
5.V-505 select the tube with the highest diode voltage with the bfo on.
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Date: Wed, 07 Feb 2001 02:35:56 -0600
Subject: Re: [R-390] testing tubes for noise
>1. Selecting 5749/6BA6 tubes for noise....remove the tube
>from V-501. Turn on line level meter adjust to vU mark, or..........................
That's a lot of work, Les. There has to be a simple method that can be
performed yielding a standardized figure of merit that can be used for selecting
the "best" tube. What about powering up the filament only off of of a battery, and
then measuring current/voltage/resistance between the elements with good
quality instruments? If we're looking for simple leakage between the elements
as a source of noise it seems that this should work.
Come to think of it, I have a Sencore LC-3 tube leakage tester around here that I
was going to re-cap. I've never even plugged it in, it was one of those things that
was too cheap to pass up. Anyone have a copy or scan of a manual for the
beast? Anyone ever use one?
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Date: Wed, 07 Feb 2001 03:46:46 -0600
Subject: [R-390] military testing methods f/tubes
OK, got it. mil-std-1311b is the answer. Go here:
http://www.dscc.dla.mil/Programs/MilSpec/DocSearch.asp
Enter 1311b in the search box and hit "go"
Then click on the "parent document" and you can download a nice 3 meg 650
page Adobe file containing all of the military test methods for tubes.
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