[AMRadio] Testing tubes

[DOXEMF at aol.com]

When I started working at a local TV shop in Senior H.S.
in the late 60's, we had the 6000A Hickok tester and
my boss said it wasn't how good the tubes tested as long 
as they worked in the set. That tester was one of the best for shorts and 
leakage indication I have ever worked with.
I would not doubt some receiver problems are caused by 
the decline in tube quality since then.
It's difficult to find any late mfg 6V6's that are reliable 
in the outputs of receivers like the SX42. I have had the best luck with 
older used ones and N OLD S myself.
6AU6's and BA6's commonly used in the IF areas have shown
the same nature. The older ones seem to last and not
develope shorts and leakage as much as the later mfg.
Of course we are talking about miniature tubes.
I have rarely have had to replace octals in a receiver rebuild
but usually most of the Min's have had to go due to shorts and leakage.
The 6SN7/6SL7 Octals are though to work and sound much
better than their functional replacements,12AU7/12AX7 
in audio apps. A subjective statement but one I think
we all can agree on as far as the quality of construction.
Enjoy,
Bill KB3DKS

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