Watch the Turnaround 6 online guitar lesson by Joe Deloro from Blues Rock Road Trip 2
Phrase 6 is a four bar T&V phrase with a straight-eighth feel. Overall, it's a hybrid of George Harrison and Eric Clapton’s styles, one motive each, in that order.
The chord progression is: E7,D7,A7,E7. The lead scale is A pentatonic minor: A,C,D,E,G,A (1,b3,4,5,b7,8) with an added F# (3) to support the D7 chord.
Combining Phrase 6 and it’s TAB variation will make an eight bar T&V period of course, but repeating measures 9-12 makes no sense for a standard 12 bar Blues.
However, with a non-standard tune like Herbie Hancock’s, Watermelon Man, it might. WM repeats measures 9 and 10 three times before going on to measures 11 and 12 (or in this case, 15 and 16). By repeating the first motive of Phrase 5 or 6 you could extend the 12 bars and keep things interesting in a similar way. Check out Albert King’s version from his album, Livewire/Blues Power for an example.