Pin 13 dictates whether the dual output transistors operate in parallel or push-pull mode:
The combination of Texas Instruments’ TL494 Pulse-Width Modulation (PWM) controller with Analog Devices’ LTspice simulation tool is a potent, albeit often tricky, pairing for power electronics engineers and hobbyists. However, this is not an officially supported configuration, leading to frequent challenges, from sourcing the right files to debugging elusive simulation errors. tl494 ltspice
A typical working model is a subcircuit ( .subckt ) that uses: Pin 13 dictates whether the dual output transistors
The output frequency on each individual pin (E1/E2) is albeit often tricky