Hi all. I recently had to change the POTS in my Musical Fidelity A5 integrated as the old one only rotated a 1/4 turn. The new POTS is an exact latter day version of the original POTS. At listening distance, there is a noticeable hum from the speakers since the POTS was replaced. The hum doesn’t increase/decrease with volume.
The transformer also used to hum a little but only noticeable at very close distance. The transformer noise is now audible from listening distance. I have changed power cords, speaker cables, disconnected the only source, and the buzz persists. Nothing else in the environment has changed or further afield in the house.
Has anyone any suggestions before I buy ferrite beads for the power cables?