What taper do i need?

[daz]

I did that long ago. I tested several 500k's i have at put a knob on them and turned the to 3 and they all measured real close. Something like around 5k if recall. Thats why i said whatever is the common % for 500k audio, thats what it surely is.[

[Chuck H]

Found this:

https://theartoftone.com/products/ct...ce-500k-550k-2

Seems to check all the boxes. 5% taper. Guarantee at 500k or more (not everyones thing but seems to matter to some). CTS brand. It's got the look with the brass bushing (I don't care but it matters to some). A little spendy, but not really if you're a guy on a mission.

These guys went to some trouble securing this part as an option for players. I think that's pretty cool. Hope this helps.

[pdf64]

Found this:

https://theartoftone.com/products/ct...ce-500k-550k-2

Seems to check all the boxes. 5% taper. Guarantee at 500k or more (not everyones thing but seems to matter to some). CTS brand. It's got the look with the brass bushing (I don't care but it matters to some). A little spendy, but not really if you're a guy on a mission.

These guys went to some trouble securing this part as an option for players. I think that's pretty cool. Hope this helps.

I can't see a taper % noted on that page?

[daz]

I can't see a taper % noted on that page?

Same here, just the tolerance is 5% but they don't mention taper %.I think chuck saw the "audiotaper-5%" but missed that under that it continues and next line is "tolerance". I can see how it would appear they are saying 5% taper.

[Greg Robinson]

Yep, that part Chuck linked is 5% tolerance, no mention of taper. Presumably the regular 10% taper.

Daz, you could try a 1Meg audio taper with a 1meg resistor in parallel from wiper to ground, this will lower the effective taper. It will mostly change the taper around 7-9 on the dial, but that seems to be where you want most of the change. At 50% rotation it will only bring the 10% taper to ~9.1%. It will also increase source impedance as you turn down, so may end up darker than you want at lower volumes unless you experiment with a treble bleed circuit (cap only, or cap plus resistor in series, no cap and resistor in parallel like I often see, which will work AGAINST your aim. That resistor in parallel with a bright cap is a LINEARISING resistor!).
Here's a graph from a spreadsheet I made, should help give you an idea of the effect.

Also note that my graph is an idealised representation. Pots never have a true curve to their taper, rather they are piecewise linear approximations of the curve. Still, this should help.

[Chuck H]

My bad. I'm three beers in and they popped up with a quotation mark "5%" in my search. Thank you for the vigilance gentlemen.

I did send an alternative solution to daz via PM. It's a dual gang 1M 10% taper pot with one gang wired as the volume control and just the CT/ground end parallel on the second gang. So, essentially a 500k pot full up but morphs into a 1M 5% taper as it's turned down. Should work fine. The dual pot will most likely be a 16mm type and though they're not easy to find, not impossible.

[Chuck H]

Here's a dual 1M 10% from Mesa. Affordable. I use their pots sometimes for their out of the box specs and have found them to be of good quality. This one looks like it may be a CTS made pot?

Not sure it suits mounting physically. but hopefully.

https://store.mesaboogie.com/product...m-10-dual.html

Wire it like this: