• 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.

Who made it?

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mdpaudio

Member
Joined 2014
What manufacture made this tube?
It’s from an old ST-70 I found.

Thank you,
Mark
 

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