Hi Declan,
>My original PSU failed recently and when I went shopping for a new one the guy in the gave me a Yamaha 9V PSU. I told him that the original PSU was a 12V but he insisted that the 9V PSU would work.
>
>What do you guys think? Am I putting my AN1x at risk by using the 9V PSU?
The original PSU was the PA-3, which is 10V DC. Later, Yamaha changed to the PA-3B, which is 12V DC. I have used 9V, 10V, 11V, and 12V supplies with my AN1x, and currently use a 12V "switching" supply that I used to sell on my website, just because it's very small and light. As far as I can tell, the AN1x is pretty tolerant of 9-12V inputs.
Bear in mind that 99% of the "brick" and "wall wart" DC adapters are of a crude and poorly regulated nature -- completely unsuitable for direct use by audio circuits. The rated voltage tends to be the minimum output, and the supply can actually be higher under normal use. To compensate, most electronics manufacturers use an IC inside the box to create well-regulated 3V or 5V DC for the actual use. These IC's will produce 5V as long as they see at least 2-3V more from the supply, so technically speaking, a very well regulated 7V supply (NOT a 7V wall wart!) would probably suffice for the AN1x. More is better -- up to a point -- only because it allows greater immunity to brownouts or poor AC mains.
If you're really concerned, I still have a couple of the 12V power supplies I use, which run off 100-240VAC. Contact me offline if you're interested.
Regards,
-BW
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Bruce Wahler
Ashby Solutions™
http://music.ashbysolutions.com978.386.7389 voice/fax
bruce@...