Photographs of the completed 4-channel unit can be seen below. The power supply modules were mounted on a sub assembly chassis, with a foldover being used as a heatsink for the PSU-8 regulators. A small 18-0-18 transformer was used to supply the 48V PSU-7 module, and a separate 30VA 15-0-15 toroid was used for the PSU-8 module.
Inside view showing bypass modules and power supply sub-assembly.
Inside view showing preamp module sets.
The back panel view showing the preamp in/out connectors at the top and the insert in/out connectors at the bottom.