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9 / 18 Volt switch

Has anyone done a switch that kicks on a second 9v to your pickups, what do you guys think that would do. Im thinking about trying it, why not after all. Only thing is, if i can run 18v, then im not sure why i would want to go to 9v, but it still might be interesting.
 
Why would you want to do that? I can understand an active/passive switch though. But if you have room inside for 18v then just go 18v. That is unless you want to prove the actual measurable side by side difference between a 9v and 18v.
Now that I could get behind. There's always been a claim of more headroom, but I never took the time do the experiment.
Let us know how it goes.
Dirk
 
I've never seen it done, but I would imagine it would be easy to do. A switch that activates another battery in series, or even smarter, a switch that activates a voltage doubler circuit (drains a single battery twice as fast).