Pearl amps

From a folder that I still have, which will be from about 1978. A version like the 4th from the left was my first "real" guitar amp. Such Pearl amps had the appearance of a fender tube amp. The buttons, the blue colors and the layout on the control panel were also very reminiscent. However, the Pearl was completely a transistor box and "distortion" was certainly not there.

The Pearl logo of my copy was different from the one in the picture. Need to find out what it looked like again.

Scheme: