I did get the Linear power supply with remote and extra input. I have some great 6sn7 and 12at7 and they take this unit to completely different level. I listened with the stock tubes and couldn't imagine it being better but the unit is even more musical with the NOS tubes . I sit here listening to the demo unit feeling sad that I will need to give it back knowing it will be a couple weeks until mine is built. The shocker is that my wife even noticed. She is a professional musician and hears enough live music so that audio gear isn't important to her. She noticed how much more musical the system sounded with the preamp. She asked me if it was the preamp that caused the music to sound so much better. She asked why I had to give it back!