• 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 testers that measure true plate current under load

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v4lve lover

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Joined 2010
You can fabricate your own measuring adapters out of some Chinese octal socket savers but these need to be disassembled.



You will need a heat gun, and some aluminium foil to protect the locating pin, to desolder them, then add a 10 ohm 2W 1% resistor in series with pin1 and solder two wires to that resistor. you can then plug in the wires by means of some banana jacks into a modern DVM and measure plate current at 10mV/mA



Another good start is these (no affiliation)

ebay Nr
392899606463
 
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