A vibrator power supply was a _mechanical_ DC to DC converter, where low voltage DC was pulsed into the primary of a transformer using a set of vibrating contacts (like a mechanical buzzer) and then the higher voltage output of the transformer was rectified. I would not be surprised if there were similar mechanical devices with produced AC output at a fixed frequency.
http://www.siliconchip.com.au/cms/A_30708/article.html http://www.siliconchip.com.au/cms/A_30674/article.html I don't know any of the details of using vibrators. I just remember seeing mention of them in some old radio book when I was a kid.
-Jon
