WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
I went for the Paraphase splitter found at Fred Nachbaur's site. It was simple and has worked VERY WELL giving me many hours of pleasant musical experience (until I accidently shorted the outputs - but that's another story).