Hi,
I am new to the forum and I'm glad I found it. I am the fire alarm supervisor for the Schuylkill Historical Fire Society. We assist in maintaining the fire alarm telegraph systems and outdoor warning devises (sirens and air horns) in the county. Our county is very tradition oriented and most of our fire house sirens are of the cold war era. I can use some help from time to time on parts and information on these old sirens so I'm hoping I can get it from this forum.
Back to the question. I recently obtained a complete Thunderbolt 1000 at a county auction and I'm trying to determine its approximate age. It is 220 3 phase. The horn grill is the 9 lite window pane style. It has the large blower with the rounded motor. It appears through the paint that the Thunderbolt emblem has the older circle around the F with the lightning bolt through it. Any help on this would be appreciated. Thanks. Tom D