Yeast starter smells sourish??

[nextgenxx]

So I made a yeast starter with harvested yeast from an IPA. Wyeast 1056. Made my starter yesterday 2 cups water 1/2 cup dme.

Been in a stir plate for about 20 hours, I just took a look and smell at it and it smelt a little sour bannannie? Is this normal and ok to pitch later today?

 

[grathan]

Which yeast? I am not sure if some are meant to smell sour. It certainly shouldn't taste sour and I would definitely taste a sample if it smelled sour.

 

[nextgenxx]

Previous brew was smack pack wyeast 1056 that i harvested from. I've always been way clean/sanitized on all steps of the way for yeast harvesting. Just smells seems strange to me, maybe im just paranoid...