Assuming its three phase, pretty close to forever if it's not in a corrosive environment, literally the only wear items would be the bearings in the motor.Allenorgan42099 wrote:I know of a few that are probably from the '50s, and I know they are getting old, but I'd be really sad if they died. How much longer do you think an STH-10 from the 50s will last?
Is that why 90 percent of the STH-10s I've seen are three-phase, not single-phase? Are the three-phase ones better sirens in general?holler wrote:Three phase STH-10s are tanks, like most of the three phase Federal sirens.
The single phase ones don't hold up that well, mainly because that motor is overworked on that siren and the fact that 90% of them never recieve maintenance and get brushes replaced when they wear out.
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