Anaheim's sirens are now long gone; they stopped testing in June of 1985 according to an article I found and were later removed in the late 80's to early 90's. However, an older public works guy told me if I looked around, I may still be able to find the concrete pads that they mounted the blower on. He knew of one at Juarez Park on 841 S. Sunkist Street.
I've been to that park a few times but last Wednesday was when I finally took pictures. It's located near the south-east corner of the park.
![Image](http://img.photobucket.com/albums/v499/yuandrew/sirens/thunderboltpad1_zpscad97b8c.jpg)
Closeup, you can still make out the marks from the blower frame.
![Image](http://img.photobucket.com/albums/v499/yuandrew/sirens/thunderboltpad2_zpsd7449354.jpg)
Since I work in the area now, I hope to find more whenever I'm on break.
Article
http://articles.latimes.com/1985-06-09/ ... -residents