Is it possible to output at 50Hz to a TV from my Macbook Pro? Under display setting my minimum option is 60Hz.

I am trying to connect my Macbook Pro to an old analog TV. I have a digital to analog signal converter and am sending signal via VGA to a composit video cable, everything seems to work fine. The TV is detected by the laptop, I can see the picture flickering (although the background photo is visible), so I believe eveything is working apart from the TV is 50Hz, and under display settings the minimum I can select is 60Hz. Is it possible to output at 50Hz from my Macbook and if so, how?
Thanks in advance to anyone who can help with this issue!

Does anybody know a solution to this.

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