TV511 not listed in Sams. Double check that.
We called it a figure 8 cord ( go figure !). Was common on quite a few
TV's radios etc. Keep in mind when plugged in it actuates a switch in
the jack so you need a good fit.
If you get the Sony part number I am sure they are on Ebay. There
may be two different numbers often. Either one is OK.
73 Zeno
LFOD !