This post will cover some of the multitude of electric and mechanical components that an owner ought to have on hand if they ever plan to DIY a repair.
I haven’t been able to confirm that every one of these is correct or current but the list comes from people who have more intimate knowledge of the STS Serge and Tcherepnin circuits.
Finally, it would be wise to contact Rex first before attempting any troubleshooting or repairs. In the past he has been exceedingly generous with advice, information, and even parts.
So, let’s get to the specifics.
LM3900N – Used in NTO, DTG, TWS, WMX and many older modules
CA3080AE – Used in PCO, NTO, WMX, SSG and old filters and VCAs.
CA3280AE – Used in ACPR, UAP, 2VCA, RING, QUO, WAD.
CA3046 – Used in NTO, PCO, WAD, PRNV, PHA and old UPAP & NEG.
CA3096 – Used in 2VCA, PRNV
LM711(?) – Used in NTO/PCO
There were some secondary sources of some of the ICs. For example, an LM3080 is a National Semiconductor version of the Intersil CA3080. Same for the LM3046, which was made by several other companies. Only Intersil made the 3280, and they’re gone.
Here’s a resource for ordering some of these:
The common opamps in Serges are still available at the moment:
LM324N – CV opamp
LF353 – FET opamp
NJM4559D – audio opamp
NE5532 – audio opamp
741 – opamp (NTO, SSG)
All of these are inexpensive. Make absolutely certain sure you get the DIL versions.
NP4250s and 2N5089s are the common PNP and NPN.
From what I’ve read, most faults on Serges are down to wires and pots.
Pots are 16mm Alpha. 50K lin for CV and 50K log for audio.
STS use Mogami for all internal cabling, Rex tells me.
Banana jacks are
E.F. Johnson, as far as I know, and all 3.5mm and 1/4″ jacks are Switchcraft.
Last but not least, keep an eye out for the Reticon SAD 1024 BBD which is a critical component in the WAD and very difficult to obtain, and the Phasers (PHA and 2PHA) contain VACTEC Vactrols but I’m not sure what the part number is.
This list is by no means exhaustive and there may be and probably are some inaccuracies. Some of these components may have been updated or replaced with the M-odules but I have seen a large number of these components in my own Oakland and Hartland panels.