The Stax jack is Allied part number 719-4043. For all headphones except the Stax Omegas, the plug fits in all the way. On the Omegas, the plug is a little fatter and does not fit in all the way, because the plastic center of the jack is about 0.25" below the base of the metal rim. So I put the jack in a lathe, and took 0.25" off the metal rim so that it is flush with the plastic insert. This modification does not affect the fit of other Stax headphone plugs. For details on how to wire the jack, see All-Triode Direct-Drive Tube Amps for Electrostatic and Electret Headphones.
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