This is all simple LM741 circuits, it's so useful, LM741's general purpose single OP-AMP. UA741's high performance monolithic OP-AMP on single silicon chip.
The video amplifier splitter circuit, it is designed to take video signal is stronger. Compensate for the loss of signal, and is video splitter video [...]
This is Simple video amplifier circuit using LM359. That use a op-amp IC number: LM395 or similar, which can work in high frequency such as LM3900 series [...]