Vintage Synth Repair

Almost forgot to mention...  NTE manufactures a lot of the SCRs that 
are no longer available.  They are available at mouser.com.  You can 
cross-ref the components at nteinc.com.

Cheers,

Guv


--- In vintagesynthrepair@y..., "kanaguvnor" <guvnor@r...> wrote:
> Ethan,
> 
> Here's the link to the 4072 schematic:
> 
> http://www.netcontrol.fi/~jocke/arptech/pdf/4072.pdf
> 
> A lot of the submodule schematics are also there!!!
> 
> Good luck!
> 
> Matt
> 
> > > Hello,
> > > 
> > > I am trying to identify 
> > > the two ICs on the ARP
> > > 4072 submodule.  The
> > > schematic shows no ICs
> > > nor does the parts list.
> > > 
> > > TIA,
> > > 
> > > Ethan
> > 
> > Ethan, both IC's are linear types. One is the LM3900N (national 
> > semiconductor) and the other is a LM1458 (also national part) you 
> can 
> > also use a RC4558 instead of the 1458. The LM3900 is drawn as 4 
> > seperate amps in the schematic because there are four OP Omps in 
> the 
> > one 14 pin IC package.  You should be able to get these from 
> Digikey 
> > on line. (digikey.com?)
> > 
> > Regards,
> > John