[Hallicrafters] When do you replace tubes?

[Jim Brannigan]

Glen,
You articulated this better than I did........
Recently, the audio died in my R-390A.  The CV-591 still produced output, so
the problem was in the R-390A audio chain.
I was expecting capacitor failure and proceed to test accordingly.  It was a
simple (and rare) tube failure.......

Jim


> I replace a tube when the equipment no longer meets
> manufacturer's specification.  Most circuits are not
> running a tube at anywhere near "maximum" and a tube
> will keep functioning satisfactorily long after a
> "tube checker" says that it cannot!
>
> The best tube checker in the world is the unit itself.
>
> Glen, K9STH