I think there is a wealth of great advice above. Probably way too much.
For example, when I see...
sigurdur wrote:I don't think I've ever had a really vigorous ferment but the job is usually done within 7 days with either s-04 or Nottingham yeast.....
... my mind automatically goes, "Tell him not to use S-04 or Nottingham because I have tasted a heap of crap beers brewed on those yeasts."
So, here am I telling you not to use those yeasts when you brew if you are experiencing a problem. For me, these yeasts are very unreliable at producing a drinkable beer. Many others will disagree and lot of others will agree.
Use SO-5 and recipes that suit it as it is a very reliable yeast.
I can't see a single bad post above - every one of them impresses me, truly.
The best I can see though is
stux's, because his allows you another method of greatly narrowing down and identifying the culprit.
I'm pretty sensitive about this off-flavour issue because I had it and it took me three years to track it down to one faulty keg weld. In that time I still won prizes in competitions but honestly, this one fault meant that I enjoyed very few beers from my brewing. I am a meticulous brewer (cleanliness-wise) and it was only pure luck that I finally found the fault.
So, a rough weld may be your problem but it probably isn't. I don't think hot break will be an issue either. So, where do you start? I think a perfectly good place to start is back at Post #2 of this thread.
Is there a quicker way of solving this?
And here's the real problem, in most cases, even one brew won't give you a final answer.
Spot,
PP
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