Watch the CC Does SRV online guitar lesson by Corey Congilio from Essentials: Texas Blues Solos
I like to include examples like this in my blues courses because we're forced to think melodically and less "lick" oriented. This solo is chock full of cool techniques but don't overlook the melody and feel. Notice how I'll weave in and out of major/minor pentatonic ideas as well as hitting chord tones via double stops etc. Generally, I'm always thinking Em or Gmajor for this one. I let the chord changes tell my ear where to go...then the hands follow. Sounds crazy but, as long as you have a good idea of your scale patterns, you can let instinct take over.