This is an A blues scale, 2 octaves. Its just like a minor pentatonic scale, but has an added b5th, which some people call the blue note.
Anyway, here it is;

---------------------------5---
-----------------------5-8-----
-----------------5-7-8---------
-------------5-7---------------
-------5-6-7-------------------
---5-8-------------------------

This may be the scale you already mentioned you knew, but in either case, you can use it to improvise over any blues chord progression in A. (Thats what your chord progression is, so...tada!)
Anywhooo, just get into it and play the chord tones in the scale over the chords in the progression, and you'll be set.