• 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.

What tubes share the pinout with the 5687?

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The 7119 is a wonderful tube. It is often considered as a 5687 cousin, but its plates (and therefore its grids and cathodes) are much, much larger. This prompted me to use them in the output stage of a headphone amp (Class A, PP, with OPT). They sound very neutral in this role.
 
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