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You can usually find an old B&W vidicon security camera ...somewhere...even if you purchased one from ebay that wasnt in the correct tv standard, most video capture cards are multi-standard, and the security cameras often ran on lower voltages.
To get the real look you really need a tube based camera, a CCD camera is too obvious that its "modern"
although i do wonder what programs are out there which could electronically apply a filter over the image in real time to mimic the look of an old camera...trouble is most cases its still only a "mimic" and you need the real thing to truly get it right.
So, most cost effective way in my opinion, look for an old cctv camera thats tube based...usually they are being thrown away
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