I always thought the Pearls looked neat, especially on power tubes. But to my knowledge it never extended tube life at all, never altered the sound and those rings holding them dried out.
I've used the silicone rings on small tubes in a phono stage as an overkill reaction to my quest to reduce harmonics, but then I always bought LN tubes in the first place. I never thought they hurt anything though, unless of course you have micro-phonic tubes and like the sound.
I've used the silicone rings on small tubes in a phono stage as an overkill reaction to my quest to reduce harmonics, but then I always bought LN tubes in the first place. I never thought they hurt anything though, unless of course you have micro-phonic tubes and like the sound.