If I link my turntable to one era 100, will it play through all my system?
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Yes, you can play it as a source on any and all rooms in the system.
To add to
https://support.sonos.com/en-us/article/group-and-ungroup-rooms
Yes, you can play it as a source on any and all rooms in the system.
You can even use it as a source in a different room, rather than where the Era is located. Clever stuff!
So, if I plug into one, it will play to all? 
So, if I plug into one, it will play to all?
Not automatically. You have to use the group feature as stated above in several replies. It can play to all.
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