Not really, as to get a balanced output from the TT you would need to reverse the polarity of the signal from the TT. I'm not sure how this is done exactly, but you can be sure it would degrade the sound quality slightly.

Besides, this doesn't make sense. Why would you want the TT's more than 30 feet away from the mixer? Unless of course you are Carl Cox and can keep a track beatmatched indefinitely just by looking at it, or are trying to shed a few pounds by running back and forth between TT and mixer every few seconds. Not only that, but the phono level signal from the TT is so low that you are liable to lose a lot of the signal simply due to the resistance of a 30+ foot cable. You really shouldn't run a phono signal for that distance before amplifying it to line level.

If you really want optimum sound quality, you should replace the RCA's on the Techs with some good quality OFC cable from a hifi/audiophile store, and keep them as short as you can so as to lose as little signal as possible. Once you have amplified the phono signal to line level in the mixer, then you should start thinking about 30+ foot long balanced leads.