humming interconnects

Not sure what you mean by having checked the ground. Is there a separate lead to connect turntable ground to preamp ground/chassis? If not, that figures to be a contributing factor, even if one was not present with the other interconnects either.

Are the ac power cords of the turntable and preamp plugged into the same outlet strip or outlet duplex, with no isolation or filtering between them? If not, that could also be a contributing factor.

Also, if the turntable has a two-prong non-polarized ac plug, you might try reversing its polarity. If it has a three-prong plug, you might try isolating the safety ground prong with a cheater plug (a 3-prong to 2-prong adapter).

Beyond that, the most likely cause is high shield resistance (or an open shield connection) in the Klyne interconnects.

Regards,
-- Al

hi -- I was using the interconnects with my Pro-Ject turntable. I thought it was a ground issue, but its the interconnect.

Once I swapped the cable the hum went away.

I had the exact same problem with a low cost set of NBS cables between my table and pre. I was very supprised as even though these were low end, NBS, they were still pretty spendy.