Where can I look for the gear Julien Doré uses?

Find and submit the microphones, and other instruments used by Julien Doré.

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 "Julien Doré studio" and "Julien Doré live" and spot gear that way.