I've seen conflicting views on the taper of 50s Centralab pots. Some say they are a 5% taper (I think the Gibson historics are 5%) and others say they are 30% (CTS TVTs). Has anyone measured old some old Centralabs, or have any experience?
Turn pot halfway ( as close to halfway as you can). Measure tab 1 and 3 ( ground and top, total pot resistance). Then measure tab 1 and 2 ( ground and out)
Divide second reading by first ( 1and 2 ÷ 1and 3 ) and you have your percentage
true logarithmic ( audio-taper) is typically 10%
linear is 50%
Cool. In my very first post on this forum, I explained how you can easily modify the taper of a pot to get a curve that is somewhere between log. And lin.
My little trick turns out to be roughly 35%, so not a centralab, but somewhat an approximation( not lin. Not log. Somewhere in between). I never knew, I just like it better. . Perhaps this could encourage others to try it?
Thanks for all the help. It definitely seems that there is variance in the values of the original centralab pots. Does anyone have any experience with the CTS true vintage taper pots? I think they are 25% taper. I was going to get a matched set for volume and tone but I was advised not to use them for tone. Any one have any input on using them for tone?
The TVT's are great pots. They have a very nice even taper in the volume spot. Would definitely get them if you are in Europe. In the States, the CTS 550k custom pots might be a cheaper bet. Regular CTS pots work just as well when used for the tone pots. It has something to do with how the taper works differently. Just buy a couple of them and try them out! They are not expensive.