Is heat dissipation really necessary? lol (Testing on my DIY inverter)
Well, in a nutshell this was a test to see how the waveform and frequency changed based on the transistor's temperature
(And overheating test of transistors)
DSO Fnirsi Pro oscilloscope:
https://a.aliexpress.com/_mLeVF2K
Multimeter:
https://a.aliexpress.com/_msGsQeO