Triumph_Rock Posted October 20, 2020 Share Posted October 20, 2020 Hi guys, I'm putting together a plan to upgrade my bass guitar. I have a Westfield EB3. I read an article on Premier Guitar, about modding passive electric guitars, for better tone adjustability. Pretty much the article states that modern pots, have a 80/20 taper? That old pots from the 50's and 60's had tapers of 70:30, 60:40, and 65:35. Unfortunately Hamer that made the audio taper pots with 65:35 are out of business. Centralab pots from the 50's or 60's had a taper of 70:30 or 60:30. I have found a modern reproductions of the old Centralabs from the 50's and 60's. My question is, does anybody know where I might still find Hamer audio taper 65:35 pots? Also does anybody know of an article for figuring out if my Westfield is wired parallel or series? Quote Link to comment Share on other sites More sharing options...
itu Posted October 20, 2020 Share Posted October 20, 2020 According to the photo the pickups are connected in parallel. This is a very common way of doing it. There have been many tapers around starting from linear and logarithmic. There still are others. Here are few curves: http://www.alpha-products.com/cd_catalog/new_catalogs/Pots/tapers.htm Quote Link to comment Share on other sites More sharing options...
PaulThePlug Posted October 20, 2020 Share Posted October 20, 2020 Quick recomendation for WD Music... just got a couple of pots from them. Quote Link to comment Share on other sites More sharing options...
Triumph_Rock Posted October 20, 2020 Author Share Posted October 20, 2020 21 minutes ago, itu said: According to the photo the pickups are connected in parallel. This is a very common way of doing it. There have been many tapers around starting from linear and logarithmic. There still are others. Here are few curves: http://www.alpha-products.com/cd_catalog/new_catalogs/Pots/tapers.htm Thanks for the graphs, I guess if an audio taper pot is logarithmic, is 65:35, the bend/curve in the line isn't severe, so not to far off from linear? I guess a 50:50 pot if it exist is for all intent and purposes linear? Or have I missed the point? Trying to learn, so I make an informed choice. Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted October 21, 2020 Share Posted October 21, 2020 18 hours ago, Triumph_Rock said: Thanks for the graphs, I guess if an audio taper pot is logarithmic, is 65:35, the bend/curve in the line isn't severe, so not to far off from linear? I guess a 50:50 pot if it exist is for all intent and purposes linear? Or have I missed the point? Trying to learn, so I make an informed choice. IIRC most 'log' pots really just have the track with a different total resistance for each half to approximate a log response. So for simplicity I'll assume a 100K pot. A 50:50 pot would be 50K at mid point i.e. the same as linear. 80:20 would be 20K at the mid point. 60:40 would be 40k at mid point. The modern higher ration gives more sensitivity at the start (anticlockwise) while the older pots would be comparatively sensitive at the high end. 3 Quote Link to comment Share on other sites More sharing options...
itu Posted October 21, 2020 Share Posted October 21, 2020 If you have time and want to build a special pot, tin a step attenuator from a rotary switch and metal film resistors. Takes some time to build, but with a quality switch, the system will last forever. Quote Link to comment Share on other sites More sharing options...
itu Posted November 1, 2020 Share Posted November 1, 2020 A picture of a step attenuator: 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.