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On Youtube, there's an Indonesian company called "Grounding Fleet Safety" (formerly "Micro Siren") which is selling Whelen sirens for ridiculously low prices. A "295SL" from them is ~$70 if I recall correctly. They don't look like authentic Whelens, but they definitely sound like it. See here...

Sorry to necropost on such an old thread, but could I please have the Mark VII siren’s servicing manual? I’ve been looking to build one for a while, but information about SP sirens is near-impossible to find.