I need some help with a Turntable problem.

I have to lengthen the wires that connect it to the amp because of furniture placement.
New wires will need to be 9 feet long.

I have two tables and need to know if one or both will be OK with this.

TT 1 is Luxman PD 121 with SME 3009 TA and Denon MC cartridge and Denon Step Up.

TT 2 is Technics SL 1200MKll with Sure M97 X MM cartridge.

Right now I have a female to female connector with an additional set of interconnects to get to the amp. I also have some HUM and suspect the midway connection to be the culprit. Hum is more noticeable on the Lux/MC set up.

I have plenty of both black and red Canare Star Quad cable L-4E6S which has 4 leads plus shield and I will tie pairs of these leads together. When I make my own interconnects I use the shield on the source end tied to ground but not on the Amp end. Should I do the same when making TT wires?

I also have the Canare F-09 RCAs.

My major concern is in the length of 9 feet and if this will be a big drawback.

I am trying to keep the albums spinning while keeping the boss happy in HER living room.

Any assistance here will be greatly appreciated.

Thank you

Gary