Where can I look for the gear Janne Puurtinen uses?

Find and submit the pianos, keyboards, synths, microphones, and other instruments used by Janne Puurtinen.

If the artist is active on social media, check places like their Instagram feed and look for musical equipment they can be seen using.

You should also do a Google image search for things like "Janne Puurtinen studio" and "Janne Puurtinen live" and spot gear that way.