The Octavia is a fuzz which creates the octave doubling effect (one octave higher) made famous by Jimi Hendrix and Jeff Beck. The Voodoo Lab Proctavia is an exact replica of Tycobrahe Sound Company’s Octavia, the model used by Stevie Ray Vaughan and considered the most desirable by vintage collectors. The Proctavia includes the same transistors, germanium diodes and transformer coupled output stage as the original circuit to produce the outrageous distortion and high octave sound heard on classic recordings like “Are You Experienced” and “Wired.”
Proctavia page at Voodoo 's website...