Well I went on my hunt Friday morning to some of the places listed. I was hoping to also get Huntington Beach's noon test as well but I later figured I won't get to Huntington for the test since I had to eat lunch and head to work.
Anyway, my first stop was Brookhurst Park in Anaheim where Ronatello mentioned there was a Thunderbolt. Unfortunately though, the Thunderbolt that was there was long gone; likely removed in the late 80's. I asked a few park maintenance people if they knew of a siren in the park. Two of them were newer guys so they didn't know but one person who had worked for the city for a while mentioned that he had remember seeing a siren at Juarez Park located at 841 S. Sunkist Street and described it as having a horn on top of the pole with a rectangular base (that should be a Thunderbolt). However, he did also say that the siren has also been removed some time in the 90's but if I look around, the concrete pad for the blower should still be there.
I thanked him for the tip and started to leave. While exiting the park, I noticed this strange pole with an electric meter on it by the entrance that I didn't see on the way in. I doubt if it held a siren though as it looked thin and was directly underneath some electrical lines.
My next stop was Buena Park Fire Station 61 at Western and La Palma; directly across from Knott's Berry Farm. This is the T-Bolt that Justin mentioned seeing on his exchange trip.
I also talked to a person in the station and had him get a picture of the blower.
I didn't see an AR timer in the bays though and the person I talked to at the station said it may have probably been removed when the station was remodeled sometime in the late 90's. I did ask if they ever used the siren to call volunteer fire fighters but was told that the station was built in 1962 after they went full time so it's only purpose would have been for Civil Defense.
I went to a Carl's Jr for lunch before heading to work but that particular location was also next to Buena Park's 2nd fire station on Beach Blvd and Artesia. Well, there's another Thunderbolt there. Unfortunately, a communications antenna had been added to the pole which blocks the rotation of the horn.
While eating, I met some people who were X-ray technicians at a nearby hospital. One of them was old enough to remember Civil Defense sirens and siren test on the last Friday of the month at 10:00 AM when he grew up in the area. His co-worker also mentioned seeing a siren at fire station in the hills (Very Likely La Harbra Heights) that was used for calling volunteer fire fighters.
There was traffic on the freeways so I had to leave after eating to get to work quickly but I plan to visit the other possible locations mentioned by the people I met that day.