I have a Hickok 800A(think that's how you spell it) and I am very happy with it. I know it can't tell you if the tube will be microphonic. You will have to test it for leakage, transconductance and the such, if it passes those tests place it in the circuit and see if it is also quiet.
Regards,
Mike
PS> I am also in the learning stage when it comes to tube testers, so.., to any gurus out there my ears are open for learning new things :)
Regards,
Mike
PS> I am also in the learning stage when it comes to tube testers, so.., to any gurus out there my ears are open for learning new things :)