Electro Harmonix Small Stone Phaser Pedal
The Small Stone Phaser, originial built by Electro Harmonics USA is the Holy Grale of silky phasing FX for stringmachines. This is the phaser sound you know from Jean-Michel Jarre's famous albums.
My Moogerfooger 12-Stage Phaser 103 sound way deep due to its 12 stages versus 5 on the Small Stone. My Schulte Compact A Phaser and the Mode Machines Krautrock Phaser got a more bandpass like character with some unique feedback added. So I use the Moog for analog synths mainly. The Schulte for my Manikin Memotron and Mellotron Micro. And the Small Stones for string machines.
Above you see two different version built in Russia.