Here's the P-50 manual for reference if you need it.

https://www.dropbox.com/sh/bexk35cv5ov2 ... al+(1).pdf

You'd need a genset the size of a car to run one of these. They pull 900 amps at startup on 208 volt 3 phase. On 240 3 phase, it's around 500 amps on startup. On 480 3 phase, it's much less at 200 amps to start the siren. That 50 hp motor is a pig and requires so much energy to start. Good to know!...

It's amazing how far sirens have come in innovation. It takes far less power to run a T-135DC than that old P-50. I wouldn't mind having a P-50 in my back yard though - I could get a big enough genset to run it =D You'd need a genset the size of a car to run one of these. They pull 900 amps at star...

Here's an SD-10B that used to be part of Cincinnati Ohio's old system. It's located at US-50 and River Road by a park. It's got the bigger Federal Logo on it, leading me to believe it was installed in the 1970's.

Here's a really old image of the San Francisco Ferry building Heath siren in 1945. An electrician was working on it at that time. Holy cow! I didn't even know that another photo of the siren still in good shape existed, let alone a close up! Where did you find this photo? The only photo of this Hea...

Here's another image of the Ferry Building Heath siren from the San Francisco Library Archive:

My apologies, I did not mean to triple post.

Here's a really old image of the San Francisco Ferry building Heath siren in 1945. An electrician was working on it at that time.

Hamilton OH's Tunnelbolt on Gersam Avenue. I touched the blower box on this one.

A little bit of an update for those interested: Harveysburg's 4/5 Thunderbolt 1000T got a new blower motor and works fine. The blower was reported to not be working properly in January. Correct me if I'm wrong, but I believe Mr. Werden fixed the 1000T. He's fixed those ThunderBolts up there several ...