They say he wasn't using a wah pedal at that time with QR and he was disgruntled with his tone. It was when he got with Ozzy he could afford better equipment. Him and the bassist from QR was such an awesome duo they really put the Ozzman on the map.
I mean on the BOO stuff. You can hear there's either a wah, flanger (def just turned on enough to give it a sound) or dual choruses to give it a "wah" sound if you listen well enough. For instance on Crazy Train; just listen to the opening riff, or even before he hits the riff when he hits those 2 notes and then pick scrapes. You can hear there's a "wah" sound or swoosh in it.
Back then, you can listen to live stuff and there was no ProTools or anythign out there so what you heard on a live album was how it actually sounded.Now adays, a guitarist can hit a unison bend and not even make it in unison and the sound engineer can bring it in unison. Or a singer can sing and be off a note and the engineer can make it sound like theyre a natural. And all this can be done live. Its bs. I understand on record, you want it to sound as awesopme as can be and the way you have it in your head, but live? I say, plug and play. Break a string, miss a note, hit the wrong note, change your solo or whatever. Be original and human.