then i am sorry i bothered you
:) I just checked, I am using the lightning 15 bnc to bnc. it's not expensive and just seems to make everything better.
i don't know about other true 75 ohm cables. i might try something like a purist or a transparent and see one day.
i think babybear here on audiogon has a po3/d03...not sure if that is close enough to help you (he also has the external clock)