slaw
FWIW:
I tried the Sil-Clear in the past. Like others reported, it’s messy at the very least.
I bought a very nice amplifier used on-line years ago. When I listened to it, it was unimpressive. I took the cover off and went in to clean connections. The upgraded fuses had a slight coating of this crap. I cleaned everything and the sound opened up. I called the previous owner to remark about it, he said, "I liked the sound that way".
My guess is the fuses were in the WRONG direction when you received the amplifier. After you cleaned the fuses you inadvertently reinserted them in the CORRECT direction. The previous owner was probably not into the whole fuse directionality thing.
"He had also screwed around with the bias as well."
bingo!