The component side of SN:998 is fully populated, with the exception of there being no Temp Co resistor (R193) and that C77 (not shown on the original schematics, but does have a place on the PCB) is mounted on the solder side of the board.Īnother Cat SRM's Board B, owned by Gregory Cox. Also, the CV Scale part of the VCF control circuit is different from the original documents. Neither the way the board was made nor the routing change matched the documents. It has some cut traces around the Volume control and jumpers to route the control to other spots on the board.
Thank you to Tony from OakleySound for confirming that the two CV Scale circuits I drew are both viable circuit options (see pages 2 of SN:998 and SN:3866 Schematics, below). I haven't done this work for Board A yet. Don't worry if your values are again different than those shown here.īelow you will find two versions of the SRM "Board B", which is the VCF/VCA section of the synthesizer.
Note: All Cat SRMs I have looked at have some different resistor values (and in some cases, trimmer values) from the schematic and from one another. I chose not to relabel every component on the schematic, but I got the ones that were hardest to read. Perhaps the corrections I show on these documents will match your own unit and save some confusion when performing the modifications, general troubleshooting/repair, or tuning.
#OCTAVE CAT MODS#
Not only do these models I've seen not match the documents, but they don't match one another either!īefore I post any instructions or information on the Factory Mods that were offered by Octave Electronics, Inc., I thought it best to attempt to correct the original documents to match the actual circuit boards we have in our synthesizers. The units I have looked at all have traces which have been cut, jumper wires intstalled, missing components, and/or extra components on the back side (solder side) of the PCB. Nor does the schematics image match the layout image. The problem though is that some of these documents (the schematics and the component layout) don't actually match the circuit boards in the SRM synthesizers that I have seen. They probably all came from one source, likely Kevin Lightner's Synthfool site. The Octave Cat SRM documents you can find on the web are all the same, at least all the ones I have ever seen.
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