• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

6SN7 coin base tubes

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Keep them around as guinea pig tubes, use them while testing out new circuits or in any other situation where you don't want to accidentally blow up an expensive NOS 6SN7. Say for instance you bought a used amp and you're not sure if it's OK or if you suspect it may have shipping damage, pop in the coin base tubes, fire it up and see if it makes sound. If it works, great, if it does blow up, at least it didn't take your good tubes with it.
 
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