This circuit was found in the 1969 RCA thyristor manual. The circuit has a limiter (clipping) with two 12 V zener diodes in opposition to cut power grid pulses that may influence the trigger.
We found this circuit in a documentation from the 70s. The circuit uses amplifiers from the time,...
This circuit was obtained in a 1973s documentation. The transistors may be BC558 for the PNP and...
This two-transistor amplifier was obtained from a 1977 Radio Handbook. The configuration is valid...