Re: Ceramic Magnets
Alnicos are an old type of magnet, pretty much obsolete in most applications, having been replaced by newer designs like ceramics, which are stronger, hold a charge longer, and are lighter weight. But like vacuum tubes, which are also hopelessly obsolete in most uses, they add character & color to a guitar's sound. They're not so old-fashioned after all.
Metal players tend to like ceramics as they're very high output, and have a bright, sharp tone which holds up well under large amounts of distortion and effects. Blues & rock players usually prefer alnicos for the tone coloring and warmth, plus they're not harsh clean, like ceramics often are. Original 1950's Gibson PAF's (considered to be the 'Holy Grail' of PU's) used A2's, A3's, A4's, & A5's, all of which are still popular today (A5's and A2's being the most common). A8's were long considered a specialty magnet of limited use, but they're getting popular lately in various bridge PU's; there's a segment of pioneers on this forum that have gone into unchartered territory and found new uses for A8's, one of the most popular being the wildcat 'C8.' A1, A7, and A9 are rarely, if ever encountered in a guitar-sized magnet. Don't know what they'd sound like, but some of us are curious.
Check out some threads on magnet EQ's and output (I've got some posts on that subject). Changing magnets makes a new PU. If you have pickup(s) that don't sound like you want them to, swapping magnets is a cheap, easy, and quick way to create a new PU. Some of us have both improved our tones and saved a lot of money, by trying different magnets. It won't solve every tone issue, but it can solve many of them. The one limitation is that you can only do this with HB's and P-90's.
So now that your head is swimming, what guitars do you have and which need to have their tones improved?