My feeling is that you can always roll off the tone if things are too bright with a 500k pot. But you can never make it sound brighter if you only have 250k pots. Most every humbucker (especially the "little" versions) can benefit from using 500k pots.
But it doesn't matter what I or anyone else likes. You say that the 250k pots in your guitar sound good to you. That's all that matters. There are no "rules". Everything we do (changing pups, magnets, pole pieces, wiring, etc.) is to find what sounds good to each of us not to follow any rules.
I used to think that too . . . but then tried playing underwound (5.6k) single coils with 500k pots. There's not enough rolling off in the universe to make that a palatable sound.![]()
What??!!!
All of the tone pots I have ever used in the past 60 years have enough roll off to make any pup sound like it's got 3" of insulation and a thick wet blanket over it. And with at least a .047uf cap it sounds like 6" of insulation.
All of my amps also have tone controls to add to that.
In general I'm not a fan of radically re-eqing an amp to suit a guitar. All of my guitars sound different (strat is bright, 335 is darker, etc) but they're all set up (via pickup swaps and wiring) to work well with pretty similar settings on my amp. With the 500k pots and those low output singles I was having to turn treble and presence off and the mids and bass way, way up. And although that was closer to fixing the brightness issue the amp overall then started sounding weird.
I used to think that too . . . but then tried playing underwound (5.6k) single coils with 500k pots. There's not enough rolling off in the universe to make that a palatable sound.![]()
The pickups in this particular setup could definitely get muffled. Issue was that there was no happy in-between zone that I could find while playing. I use my tone and volume knobs a lot in a given night and it was all like - too bright - too muffled - way too muffled - too bright again - too muffled. Even when the treble was reduced, there was something really strange sounding in the mid-range that you couldn't get rid of with the tone pot. There just wasn't any happy middle ground on the pot that I could find where it was 'just right'. Treble bleed probably wasn't helping things either.
In general I'm not a fan of radically re-eqing an amp to suit a guitar. All of my guitars sound different (strat is bright, 335 is darker, etc) but they're all set up (via pickup swaps and wiring) to work well with pretty similar settings on my amp. With the 500k pots and those low output singles I was having to turn treble and presence off and the mids and bass way, way up. And although that was closer to fixing the brightness issue the amp overall then started sounding weird.
Sounds like you were using the wrong cap value. What you described sounds like a .047uf cap (which is usually the recommended cap with singles). I have also experienced what you described when I have used a .047uf. I have never had that issue when I started using .015uf or even .010uf caps (yes, even on singles). Those will remove the highs without removing much of the mids, leaving you with an un-piercing yet clear tone...not that muffled tone that you described, which is typical with .047uf caps.
The Little 59, even though it's a single coil sized pup, should never be used with a .0470uf cap! It will definitely sound muffled/muddy. Even a .033uf is too much. I wouldn't even try a .022uf with it. That pup should be used with a .015uf or .010uf cap.
Sounds like you were using the wrong cap value. What you described sounds like a .047uf cap (which is usually the recommended cap with singles). I have also experienced what you described when I have used a .047uf. I have never had that issue when I started using .015uf or even .010uf caps (yes, even on singles). Those will remove the highs without removing much of the mids, leaving you with an un-piercing yet clear tone...not that muffled tone that you described, which is typical with .047uf caps.
The Little 59, even though it's a single coil sized pup, should never be used with a .0470uf cap! It will definitely sound muffled/muddy. Even a .033uf is too much. I wouldn't even try a .022uf with it. That pup should be used with a .015uf or .010uf cap.