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From: ed@mtxinu.UUCP (Ed Gould)
Newsgroups: net.audio
Subject: Re: speaker mod results
Message-ID: <289@mtxinu.UUCP>
Date: Mon, 25-Feb-85 16:31:27 EST
Article-I.D.: mtxinu.289
Posted: Mon Feb 25 16:31:27 1985
Date-Received: Mon, 4-Mar-85 06:00:54 EST
References: <2110@ncrcae.UUCP>
Organization: mt Xinu, Berkeley, CA
Lines: 22

> 	Last week, I removed the potentiometers and replaced them with
> discrete resistors.  The upgrade was *considerable*.  Those pots were 
> FULL of 'grungeballs' :).   ...
> ... Hmmmm, I wonder about the pots on my preamp...?

It's easy to replace pots with "stepped" controls - just use a rotary
multi-throw switch and a batch of resistors.  You can replace the
volume and balance controls with two stepped volume controls - if
you want good matching between the channels, use precision resistors
(use carbon resistors, not wire-wounds, as the extra inductance
of the wire-wounds may not be good).  I can dig out the values I've
seen used for the resistors if anyone cares.  (You nay also need an
additional resistor on one channel for balance zeroing.)

It's probably worth getting good quality switches (gold contacts,
or some such) and make-before-break switches are safer and
gentler to the ears (depending on the circuitry, they may be
required).

-- 
Ed Gould		    mt Xinu, 739 Allston Way, Berkeley, CA  94710  USA
{ucbvax,decvax}!mtxinu!ed   +1 415 644 0146