"The TubSuMo IPSs arrived for me 4 days ago. For 6.3V heater supply, I use a small transformer, nothing fancy. The amplifier biases easy without any problem, just it needs more time at startup for the offset to settle. There is no hum and the distortion is in the 0.002% region."
I highly recommend the TubSuMo IPS,it sounds extremely good and it matches perfectly my speakers-Taga Harmony Platinum f-120.