Testing vacuum tubes with a TV-7 - 12AX7 12AU7 12AT7 6V6GT 5AR4

I love vacuum tubes.
I have them in my Hi-Fi, in guitar amps and in my studio in my microphone preamplifiers.
But... How do you know when a tube is bad?
In this video I show how I test vacuum tubes with a TV-7.
I am testing a 12AX7 or ECC83
12AU7 or ECC82
12AT7 or ECC81
6V6GT
5AR4 or GZ34

Cheers from Portugal!

#12AX7
#test
#tubes

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