single tone unit btw

requires tone generator mod

AG1 to activate siren

this might be my last post for a while, i haven't been getting a lot of attention lately... i know you're gonna say "the siren community is pretty niche", but 5 upvotes is a lot for me. my more recent builds barely reach 2 upvotes and most of the people i know went inactive. even my friend @Mrcooldude went offline 💔

In 1970, the 500-SHTT would be redesigned again, with the 10/12 port rotor and stator replaced once more with the 9/12 port core from an SD-10. Reusing parts from a different existing siren model made it much cheaper to produce. Around this time, Federal would also change its naming scheme, with the 500-SHTT being renamed to the 500AT/500BT and the 500-SH to 500A/500B depending on whether it is single or three phase respectively. The 500-SH remained unchanged from its second generation counterpart. The third generation was produced until the 1980s, when the series was discontinued alongside many of Federal's older sirens as Federal wanted to streamline their lineup, and likely did not want sales to cut into the Thunderbolt. It was still available as late as 1981.