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

[Dana Scott]

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