I am running 40 feet of RCA (single ended) from a tube preamp to a tube amp. My system absolutely does not suffer any technical problems from this configuration.
As far as the argument as to single ended being better or worse than balanced, there are too many factors to make a statement based only on that part of the system.
As far as the argument as to single ended being better or worse than balanced, there are too many factors to make a statement based only on that part of the system.