• 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 checker

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audiofan

Member
Joined 2003
I would like to have a simple tube checker for : 12AX7 12AT7 &12AU7 ( guitar amp stuff )

So I desing the attached circuit

170 V 10 mA load line for 12AT7 & 12AU7

170V 2mA load line for 12AX7

0-2V bias

Should I build it as-is ?
 

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