I have this old Soviet low frequency sine and square pulse generator "G3-36A".
I ran into an interesting problem.
When I try to generate square pulse under 100Hz I get a distorted wave. Like in the image:
When I increase frequency to 100Hz this is what I get:
At 1kHz it looks more like a square:
Does anyone know what is causing the distortion and how can I fix it?
Schematic of the signal generator:
The KT603B transistors circled with red color are the ones that generate square wave. The blue ones are amplifiers.