A friend brought his Bel Canto SET amp over one time. Before playing we removed the tubes and I coated the tube pins with [redacted]. We applied [redacted] before listening to it here. So he had not heard it in my system and had no idea what if any difference it made.
Next day he called me up. When he hooked the amp back up in his system he couldn't believe how much better it sounded. Why? Then he remembered [redacted].
This was just the tube pins. Didn't do terminals, IEC, fuse holder.