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MXR Blowtorch 18v work w/ 9v power adapter?

I just got a MXR Blowtorch and it is an 18v. My entire pedal board though is based off of 9v. I have a Boss BCB-60. Will the blowtorch work off of the 9v power supply so that I will only have to plug one power adapter into the wall?
 
I had to do this a couple of times when I still had my Blowtorch. It works, mostly. I can't exactly remember, but you either get less volume, more gain, less gain...something like that - definitely related to a loss of headroom. I was able to make some adjustments and get reasonably close to "exactly like" it sounded running off of 18v.

You're better off getting an 18v power supply for long term use, IMO.
 
You shouldn't hurt anything by running it on 9v. The principle is the same as running a 9v pedal with a battery that is on its way out.

If it sounds ok when you power it up, then it should be ok. The extra voltage just gives the pedal more headroom and allows it to function as it was designed. Less power just might cause it to fart out or do any of the other things that usually tell you that a pedal has a dieing battery.