Originally Posted by BobBailey
I have found US-05 to be better the second time around. I usually don't reuse yeast because most of my beers are about the same OG and my understanding is that for best results you should use yeast from a smaller beer. That said, The couple of times I have reused it, I was making a bigger beer the second time around.
If anyone has had results indicating that the "bigger beer" theory is wrong, as are many of the "old Rules", I would like to hear about it. The extra 3 bucks would go a long way if used for hops instead of yeast
Never heard about the 'bigger beer' theory. I re-use yeast all the time in similar gravity beers without any problems. The main rules I go by are (and sometimes I break them):
1) Only reuse yeast from Primary (you start to select less flocculating yeast if you continually harvest from Secondary).
2) Don't re-use yeast from bad batches.
3) Don't re-use yeast from any beer 1.075 or higher (it will accelerate mutations and lose the original yeast character).
4) Remember, every time you re-use yeast it mutates slightly. Re-using it too many times and you will lose the original characteristics of the yeast. I generally restrict use to 5 times from the original strain (but that can still get you 20+ beers from a single vial if you do it right).
I've broken these rules many times, but that's generally because I want to get just one more beer with that yeast strain before changing out the yeast in my line-up.