Hello, Situation: This is for a pair of 6SN7 heaters, the center tap of the 3.15V supply First, the heaters center tap was elevated, I removed the elevation and I connected it to ground via a 120 ohms 2 watts resistor. But I got a slight hum, so I ordered lower values resistors to have a better grounding for the heaters center tap. I also grounded the chassis with the 3rd prong of AC power socket, I don't know if this is or could be the culprit for the hum, but first, I think about my bad grounded heaters center tap. I will soon receive: 4* 0.01 ohm 1 watt Vishay Dale 2* 75 ohms 2 watts Panasonic Metal oxide and a lot of 0.12 ohm 1 watt Generic Metal oxide What is the best choice of one or a combinaison of those resistors for this situation ? Or any other value ? Thanks for your help.