I also had this problem with my phone stage, using the integrated transformers eliminated the problem completely.
I tried all of the AC product devices and AC power cords. They did not solve the problem.
Some phono units pick up the voltage arc that happens on the thermostat. There are ways to control the wave form of that arc but most HVAC techs do not have the background to understand the issues.
I tried all of the AC product devices and AC power cords. They did not solve the problem.
Some phono units pick up the voltage arc that happens on the thermostat. There are ways to control the wave form of that arc but most HVAC techs do not have the background to understand the issues.