alpha acids

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Teufelhunden

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Hey guys, I am going to brew a recipe that calls for northern brewer hops 6.5% alpha acids. I looked on AHS website and can only find them at 10.4%. What is the best way to adjust?
 
From what I understand...

Weight x %AA = Weight x %AA
In your case that would be:
Weight X 6.5%AA = Weight x 10.4%AA

This essentially boils down to 6.5/10.4=0.625 or 5/8 of the called for weight.

If the recipe calls for 1oz of 6.5%AA hop, the you would use 5/8oz of 10.4%% hops.

Here is a IBU calculator that my be useful if you want to play around with the hop weights, %AA, and addition time.

http://www.rooftopbrew.net/ibu.php
 
Only adjust the bittering add. The flavor and aroma adds are for the oils and oil levels are not impacted by AA %. You will be a little higher for the IBUs, but not by much.
 
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