Yup, that's a Fedelcode 5QC

They had a single head Super Si-Rex and a jailbar Thunderbolt 1000 in the downtown area. Both of which were removed. Where did you get this information from? It was my understanding that the main metro cities of Iowa (Council Bluffs, Cedar Rapids, and Des Moines) all had Thunderbolts. My friend fou...

They had a single head Super Si-Rex and a jailbar Thunderbolt 1000 in the downtown area. Both of which were removed.

Great work!

The belts on a lot of these either lost tension or broke, I don't think any of the old CD era sirens are still used.

Here's another sweet angle.

I found the video and it sounds just like one, nice find!

Bit of a bump, Brendan W found another 500-DHTT at a high school while we were hunting for sirens in Yonkers, NY https://goo.gl/maps/TCDjAWbucvP2 History about their Civil Defense System: Sometime around 1942 Yonkers had purchased 29 2-horsepower sirens and placed them throughout the city and atop s...

Rotating Single tone High.

It's on the wiki https://wiki.thesirenboard.com/RSH-10

That's really awesome! Good job fixing it, hopefully you can find a new and stronger spring.