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Adding a blend pot to a Jag?


Grissle
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I'd like to add a blend pot and then use a concentric pot for the vol/tone. Looking at the diagram it seems that I can run the leads from the pups to a blend pot and then from there follow the stock wiring. Am I missing anything or does this seem correct? I've posted this before with no results, I hope someone can help me out.

Jag wiring diagram:
[url="http://www.fender.com/support/diagrams/pdf_temp1/basses/0259505A/SD0259505APg2.pdf"]http://www.fender.com/support/diagrams/pdf...0259505APg2.pdf[/url]

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I had a shedload of problems rewiring a jazz bass with a blend pot a couple of years ago, seems the blend pots you get from most of the retain outlets on the net are not actually true blend pots, there is a drop at the mid point which causes a significant loss of volume, since the 2 pot tapers do not end at zero ohms in the centre, they sort of run a bit past midway before reaching zero. It became such a pain balancing the blend with volume level that it ceased to be a useful configuration. I must add this was a passive wired guitar and you can get perfectly functioning blend pot configs with active setups, its just getting hold of a true blend pot that doesn't give you the volume drop in the middle is a pain, no matter how much the outlets protest they are selling you true blend pots, many are not, so beware.

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[quote name='Grissle' post='550670' date='Jul 24 2009, 10:50 PM']Interesting, thanks for the info. So do true balance pots exist that can be had by the public?[/quote]
yES - i think Fender do them, John East was kind enough to send me a 'spare one' he had and that had none of the centre-position drop-off.
I think its something you have to try; I was pretty disappointed it became such a struggle, and ended up going back to twin vols and master tone, the classic JB setup. Don't let me put you off experimenting!

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Al Heeley, Big thanks again, I found these, [url="http://www.darrenriley.com/shop/cart.php?m=product_detail&p=1435"]http://www.darrenriley.com/shop/cart.php?m...tail&p=1435[/url]
but not sure if they're what you were talking about?

Edited by Grissle
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yes, looks right, but these Allparts blend pots might state they're ok but most aren't.
[url="http://www.allparts.com/store/electronics-250k-pots-ep-0385-000,Product.asp"]http://www.allparts.com/store/electronics-...000,Product.asp[/url]
Not sure if you'll really know until you get a multimeter on it and check the residual resistance at the centre detente position.

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