I just dumped a full keg that had a nasty phenolic taste. The beer (APA) was beautiful, crystal clear, nice head, good mouthfeel and absolutely awful. I had two kegs from the same batch and the other was fine.
This is the second time it has happened in 150 brews or so. I'm fanatic about sanitation so have no clue where it came from. It was saved yeast, only second generation. BRY 97.
Ideas?