[sdiy] Jupiter 6 filter resistor values

[Doug Terrebonne]

Interesting but I don't think I'd want to lose HP. I mean that's one of the cool unique features of the JP-6 - resonant HP filter sweeps and the hi-pass filtering with bass boost you can get in HP mode with the res turned up. I'd miss those... Maybe it would be possible to have the new filter design switchable?

Doug 



----- Original Message ----
From: Oakley Sound <oakleylist at btinternet.com>
To: synth-diy at dropmix.xs4all.nl
Sent: Mon, June 14, 2010 11:38:31 PM
Subject: Re: [sdiy] Jupiter 6 filter resistor values

> I've been looking at the Jupiter 6 filter, an interesting dual 2-pole SVF design.

The first thing I am doing to my newly acquired JP6, after fixing it and cleaning it, is to do the thing I was going to do with my last JP6 but didn't. Rip out all six of those resistor arrays and replace them with a new array that will re-arrange the filter to a similar one to that inside the JP8, JP4 et al. That is, make the twin SVF design into the older cascaded design. I firmly believe it will improve the sound of the JP6 particularly at high resonant settings. I'll lose the HP mode but it should still be able to have BP and gain a -12dB setting instead.

Colin Fraser and I looked into this long ago and it should be possible to do without any track cuts on the voice boards. The only track cuts you need to make are on the resonance slider so as to turn the wiper voltage upside down. I'll post my findings when I finally get around to doing it.

Tony

www.oakleysound.com
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