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I'm going to be tackling this recipe for my first attempt at a kettle sour.

In the notes, it goes over procedures to make a starter. Researching I've come across sources that say you should have a heating pad under your beaker on the stir plate.

I have neither currently and I was wondering if I could get away with not doing one.

This question suggests heating the mixture to temp and then just wrapping it. Would that be effective?

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Although I have no experience with Lactobacillus, I think part of the answer is in the Brewer's Notes.

Some strains of Lactobacillus work better at much lower temperatures... Lacto pitch rate is important...

I believe since this recipe has 2 yeast strains, the pitch rate is more critical than when you have only one. So if you don't have the stir plate, you should find another way of making a starter and keep your process as close as the suggested one.

Perhaps take a look at this page : Lactobacillus Starter Guide

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    Thanks for your answer! For an update, I actually switched cultures and used OYL-605 from Omega Labs and it performed wonderfully. No heating or stirring needed! – Ovaryraptor Jan 23 '19 at 18:58
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This is what is called a "kettle sour", because you're souring it in your boil kettle, then reboiling. This gives pretty precise control over how much you sour it. This IMO, is the main reason for the specifics on the starter. You're leaving it in there for a short period of time, and you need a good yeast count for it to get the job done. The author of the recipe may have planned the yeast count vs. the time left in the kettle. 18-36 hours actually seems a bit excessive. Some pro brewers might just do theirs overnight and they determine when it is done based on pH level.

You don't need a stir plate to make a starter... while a stir plate is more efficient, using a growler is just fine. No need to over complicate it. There are calculators out there which will tell you expected cell count production in a starter with or without a stir plate.

I would wager he tells you to get the starter warm(er) because the primary goal is to get the starter/yeast to match the temp of the boil kettle (which is still quite warm). A major immediate temperature shift in a yeast slurry can blow the cell walls and kill the yeast. They can survive in a wide range, but an instant 40* rise is tough on the bugs.

If this was going to be soured and aged in the fermenter... I might suggest that the starter isn't required, as it'll have plenty of time to do it's work, but there is such a low yeast count in a liquid yeast vial that a starter is almost always a must; that said, sours, eh, I dunno, they're a different ball game. I'm trying to master this myself.

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