The part following the voltage amplification stage is composed of a bias circuit unique to the CA-2000, and when the power supply voltage of the power amplification stage is switched by a switch, it automatically switches between class A (ID = 1.4A) and class B (ID = 50mA). ) bias. It is not recommended to switch with a loud sound as it may break if you switch frequently due to the contact timing deviation of the switching relay.

There are few scratches and dirt, and it is a beautiful product for its age.