Thanks - the 1011 adds a lot to the sound; the right frequencies of midrange, while boosting somewhat.
The 1011 preamp was used with later Deep Purple albums and the 1st run of Rainbow in the 70's.
I used this particular (1011) tone with this song (he used an ENGL Savage 120; the precursor to his custom ENGL Blackmore 150) because I thought it sounded better.