Author Topic: Grapevine cap subs  (Read 1438 times)

maysink

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Grapevine cap subs
« on: October 01, 2010, 08:49:12 PM »
I read somewhere on this board a 100pf should be changed to a 151pf. But which one should I change, C3 or C9? I'm guessing C9. ANyone care to confirm? TIA!
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maysink

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Re: Grapevine cap subs
« Reply #1 on: October 04, 2010, 12:40:00 PM »
bumper
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madbean

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Re: Grapevine cap subs
« Reply #2 on: October 04, 2010, 12:59:32 PM »
I believe that is referring to C9. Going up to 151pF will let a bit more high end through when the gain pot is turned down.
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maysink

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Re: Grapevine cap subs
« Reply #3 on: October 07, 2010, 10:15:41 AM »
thx brian!
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madbean

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Re: Grapevine cap subs
« Reply #4 on: October 07, 2010, 11:43:27 AM »
Or, is it the other way around....it's a high pass filter so it is probably more accurate to say a higher value there attenuates fewer low frequencies, so that there is a broader range of frequencies passing through at minimum gain.
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CRBMoA

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Re: Grapevine cap subs
« Reply #5 on: October 07, 2010, 04:58:32 PM »
I would think at the 100-151 pf range, the differences should be nominal. But I'm just a bass player, so what do I know. :P

madbean

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Re: Grapevine cap subs
« Reply #6 on: October 07, 2010, 05:05:31 PM »
It's actually a difference of about 500Hz, so it's not insignificant. Actually, I'm struggling with this very thing on the "Rump Roast" project I'm about to release. It has a similar control with a 250pF bypass cap, which actually makes the thing incredibly bright in certain settings. By raising the value you can darken it down a bit, but then you have to balance that with it at full rotation (it's a tone control) where too high a value ends up removing a little bit of the 'wump' in the lower mids.
I own madbeanpedals (duh). I am part owner of Function F(X).

CRBMoA

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Re: Grapevine cap subs
« Reply #7 on: October 07, 2010, 05:10:39 PM »
You are just trying to get me to buy the circuit so I can try for myself................... ;D ;D ;D ;D

Actually, that does make sense. The change would not voice the pedal for bass, but it would affect the bottom end of the guitar, especially on the neck P/U.

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