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Post subject: What are the correct cap and resistor for a treble bleed?
Posted: Mon May 21, 2012 5:52 pm
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Yesterday I installed a treble bleed to control the tone drop when I turn down volume on my strat. The instructions that came with my Dimarzio pickups said to use a 560 pf cap by itself or with a 300k ohm resistor ( "270 to 330 should also work"). The closest cap I could get at Radio Shack was a 470 uf and from there it jumped to 1000. They had no 300k resistor, only 270 or 330.Having no other choice and no clue to what I was doing, I installed the 470 uf cap with a 330k resistor. As I write this I notice the uf pf difference so I guess there is where I messed up.
I installed a 470 uf instead of a 560 pf. No wonder the thing was so big. Looked like a small battery.
Now I have very little volume control.
I need some advise here. Will go back to the store tomorrow, but what should I do if there is not the exact value I am looking for? Will a 470 pf cap do the job or should I wait an order one? What about the resistor? Bought a 5 pack of 330k. Should I use those or are 270k better choice?
Advise badly needed.................THank You!!!


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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 2:22 am
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IMO you make a mistake in wiring the capacistor and resistor.
Did Dimarzio give some sketch with or only explanation ?

Only explanation could mean error in wiring


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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 6:06 am
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There are no set in stone values to use.
In my opinion, you're better off just wiring the pickups properly (Switch to tone to volume) than mucking about with treble bleeds. It negates the need for them.

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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 7:12 am
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Hi longboarder,

470 uF (micro-Farad) is 1,000,000 times the value of a 470 pF (pico-Farad). Get rid of the uF and use a proper pF cap, and you should have much better results. 270, 300 or 330 ohm resistors are all close enough that any would be fine. :idea:

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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 8:18 am
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shimmilou wrote:
Hi longboarder,

470 uF (micro-Farad) is 1,000,000 times the value of a 470 pF (pico-Farad). Get rid of the uF and use a proper pF cap, and you should have much better results. 270, 300 or 330 ohm resistors are all close enough that any would be fine. :idea:


Yeah, just came back from the corner Radio Shack and they had no idea, but Googled it and found a conversion table from uf to pf. Going back there in a few but as far as I can remember the closest they had was a .00047uf that should be 470pf. Thing is the wiring recommendation for the treble bleed was to use a 560pf cap.

Is there a lot of difference, will it work?


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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 8:37 am
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That's not a huge difference, less than 20%. Certainly well within the ballpark compared to the 470 uF. The higher the cap value, the lower frequencies bled, and you only want the "treble" or the higher frequencies to bleed, hence the small value cap (470 uF is huge by comparison). If you use too small of a value for the cap, only dogs will be able to hear the difference.

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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 8:54 am
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Thanks Shimmilou!

Just came back from the store, but it was a .0047uf what they had not a .00047......so no good. Will have to try somewhere else or order it.


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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 1:36 pm
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Yes the value of the capacitor is not the right one, but the little volume control is a WRONG wiring.


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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Tue May 22, 2012 5:11 pm
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stratele52 wrote:
Yes the value of the capacitor is not the right one, but the little volume control is a WRONG wiring.


Not really. I have wired that a few times. To add a treble bleed you simply add a 560pf cap and a 300k resistor connected between the first and mid slug on your vol pot.

The problem here is I used a 470uf cap and it is so hi value that most frequencies are bleeding thru the cap; it is almost bypassing the vol pot.


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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Wed May 23, 2012 2:03 am
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longboarder wrote:

Not really. I have wired that a few times. To add a treble bleed you simply add a 560pf cap and a 300k resistor connected between the first and mid slug on your vol pot.

The problem here is I used a 470uf cap and it is so hi value that most frequencies are bleeding thru the cap; it is almost bypassing the vol pot.


Ok I understand now


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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Wed May 23, 2012 7:18 am
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Difficult to type the "μ" symbol (micro), so we use the "u" instead. Being lazy I suppose, but maybe I'll get in the habit of using "Character Map" in Windows. Sorry stratele52.

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Post subject: Re: What are the correct cap and resistor for a treble bleed
Posted: Wed May 23, 2012 9:23 am
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Hey there, I have a couple of treble bleeds on guitars where I can't wire the tone control directly to the output, the values I use are: 0.001uf cap and 100k resistor wired paralell. You can also wire in series if you'd like.


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