Don Airey

"I use a real Hammond A100, customized by John Harburay out of Connecticut. My favorite Hammonds have always been A100s over the years; they seem to have something of a purer tone than a B-3. Live, the Hammond goes into two hot-rodded 122 Leslies and a Hughes and Kettner Puretone 100-watt amp driving a 4 x 12 cabinet. I use two effects on the organ: a Vermona spring reverb and a Moogerfooger ring modulator."

"I also just acquired a Kurzweil PC3K8—beautiful action and fantastic piano sounds! It also has improved MIDI facilities, which drive a Kurzweil K2661, on through to a rack containing a Roland Fantom, Korg TR-4, and an old Emulator, which we’re about to replace with a digital Mellotron. There’s a two-tier stand at right angles to the Hammond. The PC3K8 goes on the bottom and a Moog Voyager goes on top."

The official Deep Purple site states that Airey uses a Moog Little Phatty.

The official Deep Purple site states that Airey uses a Clavia Nord G2.

The official Deep Purple site states that Airey uses a Kurzweil PC2x.

The memorymoog can be seen 6:27 into this video.

According to wikipedia.. Airey used that polyphonic analog synthesizer on Ozzy Osbourne's "Mr Crowley", and the glissando effect is heard prominently during the intro.

Minimoog voyager electric blue can be seen to the right of the Hammond organ above his Kurzweil keyboard. from the start of the clip he also demonstrates it in this video.

"I use a real Hammond A100, customized by John Harburay out of Connecticut. My favorite Hammonds have always been A100s over the years; they seem to have something of a purer tone than a B-3. Live, the Hammond goes into two hot-rodded 122 Leslies and a Hughes and Kettner Puretone 100-watt amp driving a 4 x 12 cabinet. I use two effects on the organ: a Vermona spring reverb and a Moogerfooger ring modulator."

"I use a real Hammond A100, customized by John Harburay out of Connecticut. My favorite Hammonds have always been A100s over the years; they seem to have something of a purer tone than a B-3. Live, the Hammond goes into two hot-rodded 122 Leslies and a Hughes and Kettner Puretone 100-watt amp driving a 4 x 12 cabinet. I use two effects on the organ: a Vermona spring reverb and a Moogerfooger ring modulator."

The official Deep Purple site states that Airey uses a Boss RV5.