• 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.

4613 triode

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I found 6 pieces 4613 Philips brand, in boxes, any informations about these tubes? Thanks🙂
 

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