Regarding the GX12 connectors, ?now sells a set of all of the 6 connectors so you do not have to search all over eBay and the Internet to find them.
He also sells specific sets of 2, 3 and 5, plus pre-made cables for various functions and 2 versions of headset microphones.? I found this all out AFTER I ordered the connectors on eBay and I had to buy many of one type just to get 1.
https://www.w2eny.com/tx500/
Still awaiting delivery of my TX-500 from HRO.
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Glen - WB4KTF, Austin, TX USA
Glen Jenkins WB4KTF