Have anyone else had this problem? My last two yeast purchases, from two different online suppliers were six weeks old! for a ten gallon batch, I needed 4 litres of starter with two smack packs. It was American ale 1056, which is a pretty common yeast. I use Mr. Malty for calculating yeast requirements. It seems that there should be a better turnover of yeast inventory with the amount of homebrewers today.
Yeast from suppliers
- Thread starter zrule
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Im sure the vendor is thinking the same thing.
If you are using a stir plate I would use Kai's yeast calc over at Brewers friend. It's based on research. You'll be surprised by the difference.
I think mostly there needs to be a better yeast calculator than Mr. Malty. It makes assumptions that I think are incorrect. Use the one in the post above mine.
A six-week old yeast pack isn't really old enough to be concerned. Six months, yes.
Yeast are way more resilient than what the yeast calculators imply. How they were [mis]handled can be a more important factor. I have successfully fermented delicious beer from months old yeast that had dried to the bottom of a carboy without any other prep. A 6-week old vial is barely different from getting a vial direct from the lab.
The big difference will be in the number of cells produced after X sized starter on a stir plate.
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