Ralf Hütter

Ralf uses the AB Tubon kl 1:50

At 0:45 in the YouTube video attached Ralf Hutter can be seen singing into an early grey-coloured Sennheiser MD421-N microphone in a shockmount.

This photo shows Ralf Hütter playing a Fender Precision bass.

Also seen in this photo: https://upload.wikimedia.org/wikipedia/commons/a/a3/Kraftwerk_by_Ueli_Frey_%281976%29.jpg, showing the Orchestron (or at least its side panel) below the Minimoog.

Ralf uses a Minimoog KL 0:21

"Ralf Hütter sings through a Roland RE-201 Space Echo on the song Antenna"

Ralf can be seen singing and playing a polymoog at 1:30

The ASB can be seen at 4:53

In this Brooklyn Vegan article, there is a photo of Hutter playing a Korg VC-10 Vocoder.

At 4:06 (during the song Radio-Activity) Ralf can be seen playing a Moog Micromoog.

In the 1975 BBC program "Tomorrow's World," Ralf Hütter and Florian Schneider of Kraftwerk are seen using the Korg ARP Odyssey, as documented by The Kraftwerk Database on YouTube.

Ralf Hütter is credited with using the "Farfisa Professional Piano" in the liner notes of the release "Kraftwerk – In No Time Live 1974," as documented on Discogs.