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I know its possible to connect resistors or a resistor to your volume or tone pot to reduce its ohm readin. I have a BBQ pickup from Rio grande. I bought a couple of 1 meg pots from Torres as the BBQ needs the higher headroom or openness from the 1 meg but not 1 megs worth. My figures of multiplying the pickups k reading of 13.5 x 40 = 540 ohm pot is what I need. All the so called 500k pots I find are more like 450 or 480 on my ohm meter.

I want to take the 1 meg pot and reduce its ohmage to experiment on what tone I like. I have a feeling it will be around 650 but thats just a guess. I also find that the tone pot while all the way up is also a factor.
If I get a 650k pot or resistored to 650k then what value tone pot is the best with a .047 cap?

I also need the resistor values and instructions for my neck pickup. It is the texas and rates around 8.9 so 8.9x40= 356k pot Is that what I should use? Should I stick with a minimum of 500k on the volume even on a pickup like the texas?

I am confused. Any info is greatly appreciated. Thanks in advance.

Here's the formula, which isn't as complicated as it looks since most calculators have the 1/x key:The second formula is what you want, which yeilds 1.174 meg to get 540k. Trouble is, thats not a standard value resistor.

1.86 meg would get you 650k.

However, the better thing to do might be to use the technique that I outline here, in the vault:

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Wire up your 1 meg pot as shown. I'd probably use a 100k resistor with that. Dial it up and down until you find the quot;tonequot; you like, then carefully pull the pot out without turning the knob, and measure its value. Then use the formula to determine which resistor you need to place across it.

I am afraid you are much smarter than I. I will ask a buddy to decipher your formula. Any idiot proof diagrams?

I'll make you up a quot;table of valuesquot; tonight.

Using standard resistors, you'ld get the following:

1.1M = 523k
1.2M = 545k
1.3M = 565k
1.5M = 600k
1.6M = 615k
1.8M = 643k
2.2M = 687k
3.3M = 767k

You freakin rule man thanks a bunch

This should be in the Vault!!!!!

Vault material!!!!!!!

Anyone have a diagram of how the wires hook up to the volume pot with the resistor in place? I also run a 500k tone pot connected with a .047 cap. Thanks

Given the not-so-tight tolerances on a lot of resistors, I'd suggest that you get a trim pot, run it in parallel with the 1M volume pot, and adjust it 'til it sound good.

I think I will be ok with around 640k but not sure where the resistor hooks up to what lug etc.


Originally Posted by KLINKDETROITI think I will be ok with around 640k but not sure where the resistor hooks up to what lug etc.

The resistor connects to the two quot;outsidequot; lugs of the volume pot. Then make all other connections as if the resistor wasn't there. That is . . . like normal.

Thanks. Is this different from the 50s way where the center and ground lugs are used?