No, Rayaru is right. You might be confusing TNT (Turner Network TV, owned by Turner Broadcasting System, a Time Warner Company) with TNN, which original was The Nashville Network, which was independent outfit (may have been owned by the Grand Old Opera or some other Nashville organization or figure). It was renamed a few months after purchase by Viacom via its subsidary MTV Network to The National Network.
From SpikeTV.com:
and from Viacom.com:
MTV NETWORKS TO RE-BRAND TNN AS TNN: THE NATIONAL NETWORK