I listen to Tycho more than anyone I know (Everyday) but, I still didn't get a "Spotify Presale" code.
How are the so-called "fans" determined?
epoch didnt work for me
These codes are sent by email.
1: Make sure you postal code is up to date and you have the correct email entered https://www.spotify.com/account/profile/
2: Go to the concerts section under Browse in the app and make sure to select your city
3: Make sure you have "Spotify News and Offers" and "concert notifications" turned on to get emails https://www.spotify.com/account/notifications/
Also, check out this thread by Spotify staff: