• 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.

Old fire bottles.

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Thanks everyone for your answers. Since I will never use them they are worth whatever someone else wants to pay. I just didn't know if they were something that those who are into vacuum tubes would find attractive since they are such old NOS tubes. I have no tester available, can't just go to the local store and plug them into a tester like the old days.
 
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