Re: [AH] System 100M pot

From Modeless Factory
Sent Fri, Apr 11th 2008, 12:23

Its Japanese standard(if it is not global).

Thank you.
K/Modeless Factory.

----- Original Message ----- 
From: "Oakley Sound" <>
To: "Analogue Heaven" <>
Sent: Friday, April 11, 2008 6:46 PM
Subject: Re: [AH] System 100M pot

> > is the a=log/b=lin thing a global standard, or just for Japanese parts?
> Certainly for the ALPS and their clones A is log and B is linear. I
> don't think there is a global standard for pot markings, and if there is
> not everybody is using it. Most European manufacturers use B for log and
> A for lin. Spectrol and others have their own systems. Spectrol seem to
> use the suffix J for logs and nothing for linear.
> The only way to tell for sure is to measure it. The quick and dirty way
> is to put the pot half way around and measure the resistance between the
> track ends and then the wiper and one of the track ends. If the second
> measurement is 10% or 90% of the full track resistance, its probably a
> Other pot laws exist though, including log-log, reverse log and other
> bespoke laws, like for pan and fader controls on mixing desks.
> Roland have a very groovy law for their bender pots from the SH series.
> They have a built in dead zone in the middle and once out of dead zone
> only need a small amount of travel to cover the whole resistance of the
> track.
> Some log pot tapers are better than others though. The Minimoog's log
> pots are different to ALPS types. The modulation wheel is particularly
> ineffective if replaced by another type of log pot.
> Tony