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Thread: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

  1. #21
    Mojo's Minions ItsaBass's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Quote Originally Posted by kingswebe View Post
    Summarizing -tell me if i am misconstruing here:
    Clint and ItsaBass seem to confirm that 500K resistance is enough to allow both coils to be fully engaged in series mode - and hence no need for a No Load feature, but Clint says 500K is not enough resistance to have a normal taper. Clint says a higher pot value - like 50K - fixes the taper.

    If i construed that correctly, then 1 Meg pot - without a No Load feature - seems to handle all concerns (?)
    As for what makes no load a redundancy, I would say it depends on the output of the pickup, but 500K is a safe starting value that seems to allow the full output of your typical humbucker without needing a no load pot.

    I hear the split immediately when I roll down the 500K linear in my Jazz Bass, which is about 9K per coil, A5 powered. It's not bottom loaded at all. But again, you can choose your taper to suit your own taste. You have audio, reverse audio, and linear, which covers any tweaks you want to do to the taper.

    It isn't a question of what's right, but of what gives you the result you want. You can use any resistance value and any taper. You just need to understand what each parameter does to change things, so you can build the split to your own taste.

    If you find the control top loaded, then you probably want linear or reverse audio. If you find the control bottom loaded, then you probably want audio taper.

    Resistance value has more to do with the "starting point" of the split than it has to do with the taper. Obviously the starting and ending points are points on the taper curve of a pot...but they are only the extreme end points. It's the taper that determines what falls where along the pot's sweep.
    Last edited by ItsaBass; 06-14-2019 at 10:54 AM.
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    I do a few chord things, some crappy lead stuff, and then some rhythm stuff.

  2. #22
    Toneologist kingswebe's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Quote Originally Posted by Clint 55 View Post
    No, the usual values of 250k, 500k, and 1 meg don't taper. You have to use smaller. 50k works the best. Then you have to no load it.
    Oops, duh, i see, thanks. For some reason my mind was construing 50K as a higher value than 250K and 500K. Maybe not enough sleep last night, haha.

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    Mojo's Minions beaubrummels's Avatar
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    Default Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    The idea that a lower value pot increases the taper makes no sense. If itís linear, itís linear across whatever the resistance is, period. If itís audio taper, itís logarithmic across whatever the resistance is, period.
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    This is for the purpose of a spin a split, not a volume. A 10k resistor takes the coil to about half way down. 25k - 50k is just barely split. Anything above that is useless and so doesn't contribute to any useful sweep.
    Last edited by Clint 55; 06-14-2019 at 11:40 AM.

  5. #25
    Toneologist kingswebe's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Quote Originally Posted by Clint 55 View Post
    No, the usual values of 250k, 500k, and 1 meg don't taper. You have to use smaller. 50k works the best. Then you have to no load it.
    Is it feasible to think i could DIY the No Load feature on a dual gang or concentric pot?.... i am not sure a pot like that will disassemble with enough gap on both pots, for me to have enough space to fit in an exacto knife to cut/scrape the carbon ring. The threads on the internet that talk about DIY No Loading that i have seen only concern single pots which are obviously easier to pull apart enough to form enough gap to fit in the knife....

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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Yes, I do that. It's not too hard.

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    Mojo's Minions beaubrummels's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Quote Originally Posted by Clint 55 View Post
    This is for the purpose of a spin a split, not a volume. A 10k resistor takes the coil to about half way down. 25k - 50k is just barely split. Anything above that is useless and so doesn't contribute to any useful sweep.
    I think you need to buy an electronics book. The Duncan diagram linked earlier shows the series link being sent to ground through the pot resistance, which is effectively a volume pot on a coil.
    Quote Originally Posted by Demanic
    Incompetence is widespread in a world that rewards mediocrity while punishing excellence.
    Quote Originally Posted by GuitarFanatic
    I am currently using Skullcandy headphones I found in the garbage.
    I did find the DS-1 in the garbage.
    I once found a guitar amp in the garbage, a Peavey Studio 110. It caught fire at the first gig I played it at.. But it was at the end of it, thank god.

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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    I think you need to stop commenting on things you've clearly never experimented with. Have a little respect.

  9. #29
    Mojo's Minions beaubrummels's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Quote Originally Posted by Clint 55 View Post
    I think you need to stop commenting on things you've clearly never experimented with. Have a little respect.
    I donít think youíre in a position to say what Iíve experimented with. But you could follow your own advice with that one.
    Quote Originally Posted by Demanic
    Incompetence is widespread in a world that rewards mediocrity while punishing excellence.
    Quote Originally Posted by GuitarFanatic
    I am currently using Skullcandy headphones I found in the garbage.
    I did find the DS-1 in the garbage.
    I once found a guitar amp in the garbage, a Peavey Studio 110. It caught fire at the first gig I played it at.. But it was at the end of it, thank god.

  10. #30
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Relax, dork.

  11. #31
    Mojo's Minions ItsaBass's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    To the OP, if there is some debate/question left in your mind at the end of this thread, you can do a little testing to figure out what value pot you want.

    Get a six-way rotary switch. Get two leads with alligator clips. Get five fixed resistors: 50K, 100K, 250K, 500K, 1M (tested values). The red and black alligator clips are the input and output of the switch, respectively. Each of the resistors spans a matched set of lugs (ends up looking like an asterisk/butthole when assembled). One matched pair of lugs stays empty. Attach the clips to your pickup leads as if the switch assembly is your spin-a-split pot. Try all the resistors. Notice the first one that gives you an audible change in tone. The next highest resistance above that one is the pot value you want to use.

    E.g. You try all the switch positions, and there is no noticeable tonal difference between no resistor (open switch, i.e. full humbucker), 1M, 500K, and 250K – they all sound the same to you. But when you click to 100K, you hear the humbucker just begin to thin out. So, 250K is the pot you want to use.

    That gives you your resistance value. Then you experiment to find your favorite taper. I suggest starting with the middle of the road taper: linear. If the linear control is too top loaded (i.e. too much change happens on the high numbers on the knob, and not enough happens on the low numbers), you want reverse audio. If the linear control is too bottom loaded, you want audio taper. If it's just right (or close to it), then you keep the linear.
    Last edited by ItsaBass; 06-14-2019 at 02:13 PM.
    Quote Originally Posted by LesStrat View Post
    Yogi Berra was correct.
    Quote Originally Posted by JOLLY View Post
    I do a few chord things, some crappy lead stuff, and then some rhythm stuff.

  12. #32
    Administrator Mincer's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Knock it off, fellas.
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  13. #33
    Slutbucker Pimpologist ArtieToo's Avatar
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    Default Re: Any issues w converting a 500K pot into a 100K pot for use as a Spin-a-Split

    Quote Originally Posted by ItsaBass View Post
    Get a six-way rotary switch. Get two leads with alligator clips. Get five fixed resistors: 50K, 100K, 250K, 500K, 1M (tested values). The red and black alligator clips are the input and output of the switch, respectively.
    This is a good idea, but I think you're making it too complicated. Just use a 1-Meg pot in series with a switch. Start with the pot at max, then slowly turn it down bit by bit, flipping the switch in 'n out, 'til you hear a difference, when you do, measure the pot and round up to the next higher standard value pot. For example, if you can hear a difference at 68k, get a 100k pot. If you hear a difference at 34k, get a 47k or 50k.

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