[sdiy] Help with Jupiter 8 clone

[Peter Pearson]

Agreed.  If you don't have "hi-fi special" diodes in your Jupiter 8 power
supply, do you really have a Jupiter 8?

On Mon, Aug 1, 2022 at 2:38 PM info synthcube.com <info at synthcube.com>
wrote:

> At the risk of getting flamed (again) those special diodes are likely
> similar to other components of that era that were specially formulated to
> help keep electrons generally happy in their role serving as audio
> ambassadors and were formulated in order to accomplish those (long since
> lost) magic arts of electron-shaping and routing for optimal audio
> outcomes.
>
> -----Original Message-----
> From: Synth-diy <synth-diy-bounces at synth-diy.org> On Behalf Of John Speth
> via Synth-diy
> Sent: Monday, August 1, 2022 2:25 PM
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] Help with Jupiter 8 clone
>
> For reference, the JP8 schematic is here:
>
> http://www.synthfool.com/docs/Roland/Roland_Jupiter8/roland_jp8_service_manual.pdf
>
> The Hi Fi Special diodes are probably what Roland and others might have
> called them in the 80s. From the schematic, the only function I can think
> that they could possibly perform is over-voltage shunting. Metal Oxide
> Varistors (MOVs) perform that same function in modern circuits. I think
> those diodes are the 80s version of MOVs. A modern day PS might serve you
> better than trying to clone an ancient design.
>
> JJS
>
> On 8/1/2022 10:57 AM, Luís Marka via Synth-diy wrote:
> > Hi guys,
> >
> > I am giving a serious thought about building a Jupiter 8 clone, and
> > started to take a deeper look at the schematics (actually I already
> > ordered some of the parts, so it looks like I will get it done
> > eventually). In the PSU there are three GP-30G diodes tied at the -15,
> > +15 and +5V outputs, listed as "Hi-Fi Special" both in the schematics
> > and in the parts list. I never heard anything about a "hi-fi special"
> > diode, any idea what that means??
> >
> > Cheers!
> >
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>
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