Low distortion current driven Class-B output stage

[LKA]

the final form of the prototype and its circuit diagram

 

[moschfet]

Congratulations, absolutely great!

 

[jxdking]

I never thought this topology could be such low distortion by it alone, considering there is only about 60dB NFB around output transistors.

 

[printnik]

Low distortion + soft tube limitation.​

 

[LKA]

NICE !

AB mode I tried only once. It began oscillate and the output transistors burned. I didn't deal with it since.

 

[printnik]

In such a scheme, there are no through currents between 2SA1837 and 2SC4793.
The phase margin of 55 degrees.
The output 30MHz transistors should not burn out.

 

[LKA]

I know, it shouldn't. It works well in the simulator. I'll try to recompensate it, or maybe a new pcb will help.