This circuit allows you to adjust the balance between channels of a stereo amplifier. The circuit makes use of an analog indicator with zero in the center of the scale.
We found this amplifier in a 1990 documentation. The transistors are common, having been made...
This circuit, which can serve as a reference for restorations, was found in the October 1989 issue...
We found this circuit in an 80's Radio Electronics. It can still be easily assembled as the used...