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Post subject: what is the difference in the wiring on "62" p and
Posted: Tue Dec 22, 2009 9:04 am
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I have a MIMp but I have some Am pups on the way for xmas.I was looking at the schematic on the fender sight and the "62" have the cap going from the tone to the vol and the Am have the cap gonig from the tone to ground .Can you tell me why and if I want that vintage sound which should I use? :?:


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Post subject: Re: what is the difference in the wiring on "62" p
Posted: Tue Dec 22, 2009 5:39 pm
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pfunkin wrote:
I have a MIMp but I have some Am pups on the way for xmas.I was looking at the schematic on the fender sight and the "62" have the cap going from the tone to the vol and the Am have the cap gonig from the tone to ground .Can you tell me why and if I want that vintage sound which should I use? :?:


Oversimplified: With both pots on '10' there is no difference. It is when the volume and/or tone pots are lowered, the way the cap is wired affects the taper of the pots and cause a bit more treble retention (perceived as clarity) in some instances.

If you are going for the, "vintage" sound, remember, it is more a culmination of the sum of the parts. As sound is subjective, try wiring the cap both ways and see which you like better. If you don't want to get into that then obviously, wire it like the 62.

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Posted: Sat Dec 26, 2009 2:39 pm
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What kind of capacitor you use will have an impact too. On both the '62 and very recent USA basses the cap is a ceramic disc. Ceramic disc caps have a slightly edgier tone and more aggressive sound than the green poly chicklet cap that is probably in your MIM bass. I'd suggest seeking one out and trying it. Should cost no more than about $1.

For a great while, like 25 years, only 0.047 ceramic caps were available. However with the huge tolerance variation inherent in a ceramic disc cap the 0.047 caps were essentially the same thing as a vintage 0.05 cap. Fender continued to label most new diagrams 0.05 even when only 0.047 caps were available.

The ceramic caps Fender USA is using now are labeled 0.05. I'm guessing they specially contracted with a supplier to make these especially for them as they are the only ceramics labeled 0.05 around other than vintage ones. You should be able to get one at any Fender dealer. If there is no dealer nearby you should be able to find one of the 0.047 ceramics at about any electronics parts shop or radio/television repair shop and it would be just as good and probably cheaper.

Because of the tolerance variation, it is probably wise to buy at a shop with a capacitance meter and get one that reads as close to 0.05 as possible. Most ceramics have a 20% tolerance which means the cap could actually read as low as 0.04 or as high as 0.06 and either extreme would make a difference.


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Posted: Sat Dec 26, 2009 3:10 pm
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Merry Christmas Brother Dave and all the masters of the low end.Brother Dave I went to your site then to axgrindes and got an orange drop cap,I really like it thank you>What I'm wondering is why on the 62 they put the cap from the tone to vol,and on the new ones they puy it from the tone to ground. What is the difference? :?


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Posted: Sun Dec 27, 2009 3:48 am
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As far as I can tell either way the cap is dumping the highs to ground. The movement of the ground connection on the diagram probably has more to do with the shape of the cap being used and ergonomics of assembly.

I know the 62 jazz used tube shaped axial caps which would have just naturally fall into place to be wired in more of a straight line. The 62 RI P-Bass diagram shows a tube shape axial cap also. http://www.fender.com/support/diagrams/pdf_temp1/basses/0190116C/SD0190116CPg2.pdf

The American Standard P-Bass diagram features what appears to be a radial design chicket type cap which doesn't naturally fall into place over a wide space and would be more suited to same pot grounding. http://www.fender.com/support/diagrams/pdf_temp1/basses/0193200_02A/SD0193200_02APg2.pdf

I really don't think it matters in how the cap impacts the tone or the volume. You are just bleeding treble to ground and it doesn't matter where it gets to ground. So which type cap you use, radial or axial would help you determine where to hit ground.

HERE ARE TWO CAP RADIAL CAPS of different types (ceramic & mylar) but the orientation of the leads would just more naturally want to have both leads terminate on the same pot:

Image
Image


THE FOLLOWING IS ONE EXAMPLE OF THE AXIAL CAP DESIGN which would more naturally want to have the leads terminate on different pots:

Image


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