'303 env mod pot - thanks

[Fraser, Colin J]

> -----Original Message-----
> From: Trevor Page [mailto:trevor at resonance.fsnet.co.uk]
> Sent: Saturday, April 22, 2000 5:21 PM
> To: synth-diy at node12b53.a2000.nl
> Subject: Re: '303 env mod pot - thanks
> 
> > In what way is the pot unrepairable ?
> > If the track is intact and it has just lost it's contact 
> with the pins, a
> > bit of silver conductive paint can fix it.
> > I've repaired some 303/606 pots that were in a very bad way...
> 
> The three tracks have worn where the outer edge of the 
> plastic rotating part
> touches the little pcb. The three tracks leading form the 
> carbon track have
> been neatly spliced about 1mm out from the carbon track itself. This
> happened because the plastic part had split slightly at one 
> place, which
> caused a nasty sharp edge to rub against the tracks.... bah..

This is the worst feature of these pots - that bit of plastic had cut
through *all* the pots on a 606 I fixed up for a friend.
I engraved a little groove just below the surface level at the points where
this plastic bit cuts the tracks and painted over with silver conductive
paint. The paint in the groove is out of the way of the plastic cutter.

Whenever my mates play with my 303, I remind them not to apply any downward
pressure on the knobs - they only need to rotate.
Some heavy handed bastard rubbed the gradiations round the filter cutoff
knob off the front panel of my 303 while I wasn't looking.
Hence the retriment of the original 303 analogue section.
They just weren't built to last...

Colin f