Reddit mentions of StarTech.com 6 ft. (1.8 m) VGA to BNC Cable - HD15 VGA to 5 BNC - Coaxial High Resolution - Male/Male - BNC Cable - (VGABNC5),Black

If by component card, you mean this, the IF-C01COMG, it also supports RGB, and RGBHV at that. You just need to switch it to RGB mode(something I wouldn't be able to tell you how to do).

Hooking a PC up to that would be even easier than a PVM or BVM, given that you can use the standard separate horizontal and vertical sync that VGA uses rather than combining it into C-Sync.

In that case, you'd want to get a VGA to 5BNC like these:

• https://www.amazon.com/gp/product/B000067SM6/
  
  
• http://www.monoprice.com/product?p_id=566
  
  On the other hand, if you do have some odd card that does only support YPbPr and not RGB(INCREDIBLY unlikely), no, the cable you showed will not work for what you're trying to do.

Used one of these guys,

https://www.amazon.com/gp/product/B000067SM6/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Thanks to /u/KyaDash:

>If by component card, you mean this, the IF-C01COMG, it also supports RGB, and RGBHV at that. You just need to switch it to RGB mode(something I wouldn't be able to tell you how to do).
Hooking a PC up to that would be even easier than a PVM or BVM, given that you can use the standard separate horizontal and vertical sync that VGA uses rather than combining it into C-Sync.
In that case, you'd want to get a VGA to 5BNC like these:
https://www.amazon.com/gp/product/B000067SM6/
http://www.monoprice.com/product?p_id=566
On the other hand, if you do have some odd card that does only support YPbPr and not RGB(INCREDIBLY unlikely), no, the cable you showed will not work for what you're trying to do.

It may only work with a monitor like the JVC I have due to the sync situation but I'm not 100% sure and don't have a Sony PVM to test it on.

If this method doesn't work, you can always follow the guide's method:

http://wavebeam.blogspot.com/2016/02/the-groovycube-diy-console-that-plays.html

I'm using a 14M2U and I use this cable

It has 5 BNC cables, with separate cables for H and V sync, but if you enable csync in vmmaker, the grey cable becomes sync and the black cable does nothing.

Works perfectly for me! :)

That cable will work, but you'll need 5BNC-5BNC cables to go from the cable to the Runco. If 6 feet is long enough, I would get this instead: http://www.amazon.com/StarTech-com-6-Feet-Coax-Monitor-Cable/dp/B000067SM6/ref=pd_cp_e_0. It has 5BNC male instead of female like you found. Also, component and RGB signals are different and won't work together. It's not just about H&V missing, they are different sync types.

i would try

console -> scart to rgbs ->Extron Rxi -> 5BNC to VGA->VGA to RGB DB 9 Pin -> TV