• 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.

Alps step attenuator

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I bought 9 pcs of this Alps 250K step attenuator from e-bay. My friend opened one up and found that it is a real step attenuator.
 

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