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Post by johan on Nov 5, 2006 16:15:29 GMT -5
I've done this mod succesfully before, but forgot all about the resistor that is offhandedly mentioned. Never tried it.
What would its purpose be? To fight extra noise coming in with the treble?
Had I read more carefully I would have tried and compare but don't want to get messy on somebody else's guitar.
thanks
j
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Post by JohnH on Nov 5, 2006 21:27:17 GMT -5
The purpose of the treble bleed cap is to compensate for loss of treble due to the capacitance of the cable. The treble that is shunted to ground via the cable is compensated for by extra treble fed through the cap. The idea is to keep the treble and the lower frequencies roughly in proportion as you reduce volume. It’s a compromise, and with a single cap it only really is in balance for one volume setting, for a particular cable length. Turning the volume lower than this, there is too much treble bled through, and the sound is too bright.
Putting an extra resistor in parallel with the treble bleed cap seems to keep the tones in better proportion through a wider range of volumes. Although it is not perfect, it is much better than no treble bleed provision. My current view, best guess, is that for a 500k volume pot, a 1nF cap in parallel with a 220k resistor is a good compromise. It’s a matter of opinion however.
John
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Post by flateric on Nov 6, 2006 2:11:23 GMT -5
I use a 220k resistor in parallel with a 2.2nF cap on HB guitars, I can't remember where this advice came from, maybe Melvyn Hiscox book or another electronics website, but it does the job.
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Post by johan on Nov 6, 2006 12:49:30 GMT -5
thanks so much guys. Ill go for the 1n and 1?0k resistor.
this could go in the faq, john terrific explanation.
j
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robrhy
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Post by robrhy on Nov 7, 2006 7:36:51 GMT -5
Tried this with & without the resistor and to be honest could'nt hear any difference.
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monradon
Meter Reader 1st Class
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Post by monradon on Nov 17, 2006 21:38:12 GMT -5
what sizes to use with 250K pots  |
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Post by JohnH on Nov 18, 2006 0:18:34 GMT -5
Not sure, all my experiments have been with 500k pots. But I would expect that with 250k, the treble bleed components would be the same as for 500k, since they are compensating for the cable which is the same. So I'd vote for 1nF and 180k, subject to listening to it
John
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