• 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.

Tube Operational Amplifier

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PRR

PRR

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Joined 2003
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> useful application of an Op Amp. Don't know if any of the current testers use this tho.

Har. That seems to be a variation of how you measure building ground/earth resistance with fall of potential over three points. (Not THE SAME but I suspect it can be manipulated to show the resemblance.)
 
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