Experience with finals on my T-4XB prompts some questions. Can a simple
emissions tester be used in any way to estimate 6JB6 performance in circuit?
Can that tester be used to "match" 6JB6 tubes? Evidently these transmitters
were pretty picky about what PA tubes they would tolerate, with differences
between manufacturers being an issue.
Another thing I'm wondering is whether most of the 6JB6 tubes for sale these
days are used and maybe already worn out. One pair I bought off the web
were pretty useless in my T-4X. Any source of known-good 6JB6s?
Changing out the finals and then neutralizing them is a pain in the rear I'd
like to do rarely, would like to somehow know that the replacements are
better than the soft tubes being replaced.
73, Curt KB5JO
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