We’ve updated the QuadVol page. Now, the part list is online. For German customers, Reichelt Elektronik is usually a good source for standard components. However, both ICs needed for this project are not available at Reichelt. The volume control IC is often available on eBay. However, there is a risk that you get a fake IC. Therefore I would recommend to buy the parts from a well-known supplier, like Digikey, Mouse or Farnell.
We’ve updated the Shunt regulator page. It now contains a link to the original design from Klang & Ton and the list of all parts needed to build this circuit based on our design. Still looking for a shunt regulator power supply for your audio circuits – check it out!
For a complete power supply you will need an additional rectification and smoothing circuit and a transformer with dual secondaries.