PCB - top view
THD OPS3 22V
THD OPS3 60V
THD iAMP100M 20V
Cliffjumper is a classic fully symetric front end with nice CFP cascoded VAS stage. This kind of VAS stage was developed by one of the forum members from diyaudio.com
The CFP VAS was used very often by the Yamaha, the additional part is one extra cascoded transistor. The upper VAS transistor is turning off very smoothly providing soft-clipping behaviour.
Constant current sources are referenced at the opposite power supply rails instead to signal GND. There is no additional currents comming back to PSU threw a clean signal GND path.
Very basic and simple design but performs very well.