Watch the Modified Eight Solo 3 online guitar lesson by Chris Buono from Guitar Lab: Blues Soloing
Throughout Blues Soloing there's many instances of triplet-laden rhythms being played including the three choruses here in Modified Eight. While the solos could very well have been written in 12/8, they're presented here in 4/4 so you can better see the triplet rhythm on paper in all its splendor. That said, be aware if you're studying a solo that does not display any triplet notation in the chart that should not indicate an absence of triplet feel. Just look next to the tempo marking and if you see two eighth notes followed by a quarter note and eighth note within a triplet bracket separated by an equals sign then you're playing with an underlying triplet feel known as "swing."