The 2T22 and later 3T22 came out in 1954-1955. They were based on the already successful STH-10, STL-10 models, which were introduced in 1949. Some of the very first 2T22s were installed in aftermath of Udall, Kansas F5 tornado of May 25, 1955.kagome122885 wrote:I would like to know when these wonderful line of sirens were introduced, and the final year they were offered.
Gil got answer number one. I would figure the second answer is because there was probably not renewed interest in dual tone sirens after the Cold War was over, though some companies such as ASC and Sentry kept the dual tone alive.FS T-Bolt wrote:Now James, you say that the 2T22 was a dual-tone siren only and that the Thunderbolt could be single-tone, which to me means that CD and EMA prefer single-tone sirens. Why? What's wrong with dual-tone sirens?
I have no idea. As far as I know dual tone sirens are always gonna be softer than single tone sirens if there is a single tone equivalent. I don't know ask Federal that question.FS T-Bolt wrote:I do agree with 500AT, dual-tone sirens get your attention much better. But so what if the Cold War is over? Why don't the companies try to figure out how to make dual-tone sirens louder? So many of the sirens today sound almost the same.
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