what conditioner to use with tubes

I found an isolation transformer helped my own preamp a lot. If you want to try it, get one with a fair amount of headroom, say double your preamp's wattage draw. It shouldn't make any difference whether the unit is tubed or solid state.

Running Springs Audio Duke.

another vote for Running Springs Audio. the Haley will do fine.

If your happy with the p-300 on the digital, maybe pick up a used p-600 or p-500, you can sell the p-300 to help finance the larger power plant. I use a p-500 with a tube preamp, tube D/A, tube phono stage, transport, tuner and xm tuner. I use approx. 45% or 200 watts indicated from the power display on the p-500 and the sound is excellent at least for me anyway.

The Panamax Pro-5510 is a prosaic but excellent choice. It includes two inductorless high-current outlets. I use one on my Audiopax 88 tube amps and it sounds best and removes the most noise of many alternatives tried. It gives you transformer isolation and choice of balanced power on low-demand sources too. I am getting another for my 300B monoblocks on another system.

Phil