[sdiy] Re: Source of 2N5459 FETs or building ARP clone

[Steven Downhill]

Cheers for the info.

Regards
Steven

-----Original Message-----
From: Dana Scott [mailto:danas at egosys.com] 
Sent: 18 March 2004 14:32
To: Steven Downhill
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Re: Source of 2N5459 FETs or building ARP clone


>Let's see...Off the top of my head, there's not a whole lot in an ARP that
is
>completely extinct
>1)You will need a source of slide(or rotary, perish the thought) pots in a
>number of values. well, actually, all you really need is 100K linear, 100K
>audio, and 1Meg  audio.
>2) 1.87K tempco thermistors..other values are more common. a little
re-scaling
>will be needed
>3)  you might have a bit of trouble finding an exact copy of the multi pole
>transpose switch.
>4) The 2n5910 in the oscillator is a little rare by now.
>5) the 2n3958 (iirc) dual fet might be obs too
>6) 2 bus pratt-reed keyboard
>7) top octave divider in the Omni, getting hard to find
>8) Hamamatsu vactrol array in piano, phaser2 and bi-phase probably extinct.
>9) piano keyer chips - gone
>10) ? I don't know, it has been 25 years.....
>The rest of an ARP is just opamps, transistors, resistors and capacitors.
>-Dana

>
> I've looked at this schematic before and always wondered what the FETs
were
> as they're just labelled with (I assume) ARP's own part number.
>
> I would love to be able to build my own ARP Odyssey or 2600 at some point
in
> the future.
> Do you think that this could be done using the schematics / service
manuals
> from the Net and finding equivalent semiconductors to those which are now
> obsolete?.
>
> Regards
> Steven



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