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The earliest HeadAmp electrostatic amps used authentic black Stax jacks (2003-2004). Then Stax stopped selling the jacks because they didn't want other amps being built. The black jacks I have been using ever since then are surplus Amphenol connectors that happen to fit Stax headphone plugs. My supply of those had run out, so I had my own jacks machined from teflon with machined gold-plated pins, the same one I'm selling on eBay. The batch of BHSEs that is shipping now uses my remaining black jacks on the black, blue, purple, and some gray amps. The silver and some gray amps have the white teflon jacks. In the future, all of the amps will use the teflon jacks
Are the surplus Amphenol connectors as good (regarding reliability and SQ) as your own jacks? "machined from Teflon with machined gold-plated pins" is impressive, while "surplus" sounds a bit unflattering...