My advice, owning both tube amps for music and LOTS of guitar amps with tubes, is don't bother with the tube tester. A good one is going to cost you lots of money and not worth it for the number of times you will use it. I almost bought one a long time ago, and got this advise from a tube and amplifier guy, "don't waste your time, focus on the music". Sound advise to this day. IMHO of course.
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