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-   -   alpha acids (http://www.homebrewtalk.com/f39/alpha-acids-200711/)

Teufelhunden 10-14-2010 08:22 PM

alpha acids
 
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?

RugenBrau 10-14-2010 08:57 PM

http://www.howtobrew.com/section1/chapter5-4.html

this should help you figure it out.

ridnpowder 10-14-2010 09:04 PM

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

Pappers_ 10-14-2010 09:05 PM

or plug them into a brewing calculator program, like Beersmith

david_42 10-14-2010 10:38 PM

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.

Teufelhunden 10-15-2010 01:06 AM

Thanks guys!!!


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