[Swan] tube testing

[w7lrd at comcast.net]

Gary-Interesting web site of yours.  I believe that over the years that is what I have been doing.  In that when my finals were showing low output I would replace both of them, when probably only one was really down and the other was still 'so so".  At least now I have them better defined.
73 Bob W7LRD
Seattle

-------------- Original message -------------- 
From: "Gary Poland" <gpoland1 at cinci.rr.com> 

> Bob, 
> Probably the best way to test tubes used in the PA of any rig. I used to 
> do the same, further matching them by measuring the voltage drop across the 
> cathode resistors ( Drake ). A few years back I bought a Hickok 6000A tube 
> tester and have gotten a feel for good tube, bad tube. I went through dozens 
> of old and new 6JB6's throwing out the very weak and matching up pairs of 
> good ones. I was surprised to find in some cases a pair that were replaced 
> still had one good tube, like for some reason they aged or weakened 
> differently. 
> 
> 73, Gary W8PU 
> http://home.cinci.rr.com/w8pu 
> 
> 
> _______________________________________________ 
> Swan mailing list 
> Swan at mailman.qth.net 
> http://mailman.qth.net/mailman/listinfo/swan