This DIY 550A from Brian Horvitz is a clone of API’s classic, 3-band equalizer. Horvitz’ design departs slightly from the original in order to use commonly available, modern components. Kits and PCBs will most likely be offered within 2011.
- Accepts all standard-footprint discrete opamps
- Uses Ed Anderson’s replica of the API 2503 output transformer
- Does not require custom switches
- 500-series compatible
- Employs high-quality WIMA capacitors
Price: Not announced yet