Phil,
Those devices you posted the link to are available locally and do not do the job. They're intended for turntables that do not have a built-in preamp and do not have the correct impedience or any volume controls. They can be purchased for $29 at a nearby electronics store.
Gary
_________________________
PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)