I have had great success in my home brewing, but lately my beers all seem to have this strange off flavor. I do not drink a lot so I'm wondering if my beers are just going stale, I finish a corny keg in about 3 months. The flavor is a back of the tongue flavor. A commercial beer with this same flavor is Adnams Broadside. I also wonder if the flavor could be diacetyl.
Right before kegging my beer I always take a taste test from the uncarbonated beer and it seems okay, but when I get around to tasting the beer later on here comes that flavor. I have cleaned all of my faucets and corny kegs and replaced all of my beer lines in my serving system and still the flavor pops up.
I use the two water cooler method and produce ten gallons at a time, I boil for at least 60 minutes, use only white labs yeast. Ferment inside at around 70 degrees in glass carboys.
