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HOW-TO: Using a stir plate and flask to make a yeast starter
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kal
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Joined: 12 Dec 2010
Posts: 8074
Location: Ottawa, Canada

Drinking: American Lager, Electric Hop Candy Jr, Scottish 70/-, German Pilsner, Russian Imperial Stout, Black Butte Porter, Saison, Kölsch

Working on: Kölsch, Janet's Brown Ale


PostLink    Posted: Fri Apr 07, 2017 1:03 am    Post subject: Reply with quote


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Added some info/pictures to the first post on the induction cooktop and saucepan I use... always wanted to get 100% out of the kitchen. Now it's done! Works great too - much faster than the flame burner on the stove I was using before. I should have known that electricity was better than gas! Wink

Kal

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blazinlow86



Joined: 15 Jan 2017
Posts: 94
Location: vancouver bc


PostLink    Posted: Thu May 04, 2017 4:47 pm    Post subject: Reply with quote

I'm was gonna order this stirplate but noticed the link has 2 available. The 801 at 79.00 and the 601 with stand for 49.00. anyone know the difference. They appear to have the same specs? Thanks
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kal
Forum Administrator


Joined: 12 Dec 2010
Posts: 8074
Location: Ottawa, Canada

Drinking: American Lager, Electric Hop Candy Jr, Scottish 70/-, German Pilsner, Russian Imperial Stout, Black Butte Porter, Saison, Kölsch

Working on: Kölsch, Janet's Brown Ale


PostLink    Posted: Thu May 04, 2017 5:19 pm    Post subject: Reply with quote

You want the 801. The 601 comes with a holder you don't need for our application. Not sure if they are the same base model stirrer. I would assume not given that it costs less to add the holder. Good luck!

Kal

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blazinlow86



Joined: 15 Jan 2017
Posts: 94
Location: vancouver bc


PostLink    Posted: Sun Jun 18, 2017 10:17 pm    Post subject: Reply with quote

ended up buying the malestrom and a 1L and 5L flasks. when i was gonna order the 801 it was 80$ plus whatever for the holder. the malestrom was on sale for 105 and its big enough to hold the 5L flask. its a beast on full speed too. both of my last brews have been with the stirplate, liquid yeast and pure o2 for aeration compared to my old method of shaking the carboy and sprinkling us-05 on the top and they have both been VERY good. all the others have had a similar off flavor too them.
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David_H



Joined: 13 Nov 2013
Posts: 126
Location: Savannah, GA

Drinking: Dry Irish Stout, Electric Pale Ale, American Amber Ale, Irish Red Ale


PostLink    Posted: Mon Jun 19, 2017 1:07 pm    Post subject: Reply with quote

Quote:
Once cooled it's dumped in a flask that's already half full of cold water.


So you are only boiling half of the water (w/ DME) and then mixing with cold water to bring the liquid volume up to the total volume? Do you pre-boil the cold water or just use tap water?

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David

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zoranerceg



Joined: 09 May 2017
Posts: 1



PostLink    Posted: Fri Oct 13, 2017 3:37 pm    Post subject: Reply with quote

hey Kal tell me wich aeration method u are using on yeastcalculator.com stiplate J Zainasheff or K Troester?? thanks
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kal
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Joined: 12 Dec 2010
Posts: 8074
Location: Ottawa, Canada

Drinking: American Lager, Electric Hop Candy Jr, Scottish 70/-, German Pilsner, Russian Imperial Stout, Black Butte Porter, Saison, Kölsch

Working on: Kölsch, Janet's Brown Ale


PostLink    Posted: Sat Oct 14, 2017 5:05 pm    Post subject: Reply with quote

I don't use yeastcalculator.com.

Kal

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David_H



Joined: 13 Nov 2013
Posts: 126
Location: Savannah, GA

Drinking: Dry Irish Stout, Electric Pale Ale, American Amber Ale, Irish Red Ale


PostLink    Posted: Sat Oct 21, 2017 1:27 pm    Post subject: Reply with quote

I don't use yeastcalculator either, but I would go with the Kai Troester model. Kai has done some very extensive research into yeast growth models. Click on the link [K. Troester Stir Plate Option] and read his research. Based on my understanding the data presented in Yeast: The Practical Guide to Beer Fermentation [Chris White and Jamil Zainasheff] was very limited and simple testing. Kai's research lead to his conclusion that the final yeast cell count is based on the amount of sugar (measured as grams of DME) in the starter. The final count is about 1.5-2.0 Billion cells per gram of DME.

A 1 liter starter at 9P (~SG =1.036) (1 liter water + 100 grams DME) contains 100 grams, therefore the final yeast count will be about 150-200 Billion, if you use a stir plate. It really does matter how much yeast you started with the final count is the 150-200B. If you start with 150B you will get about 50B growth, if you with 50B you will get about 150B growth; end result is about 200 Billion either way. Yeast will multiply like rabbits on steroids. Shocked Just give them the right environment. If you only start the 10 Billion cells, 10 > 20 > 40 > 80 > 160 B. That's only 4 generations and they will double about every 2 hours, so it will only take about 8 hours to complete once they get started.

So I don't worry so much about how much yeast I start with, I just adjust my starter volume / grams of DME to get the final yeast count I need and maintain about a SG of 1.040ish.

If you need to step up a starter I would run the first starter and then only add about a 1/4 of the first starter in the second starter, and put the other 3/4 in the refrigerator to settle out.

David Shocked

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Kal Clone Controller
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SS Brewtech 14 gallon fermenter w/ gycol chiller
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