The Siren Board

Lower voltage means higher current. I'd connect several 6-volt motorcycle batteries in parallel.

75 amps is probably right. Concerning DC motors, you are always going to see some ridiculous amperages. I think most mechanical fire sirens like the Q draw anywhere between 80-120 amps during operation. When you get into bigger sirens like the T-128, you are likely looking at several hundred to 1000 amps.

I have an old Model 76 missing the front grille, and I've wondered about replacing the motor with a 120 volt one. Has anyone tried this?

Sorry for yet another massive bump, but I think I have figured something out.
Previously, I mentioned that the 76 pulls 75 Amps at 12 volt, and using the equation V=IR (12=75R) the resistance of a 12 volt 76 is 0.16 Ohm. Assuming resistance is constant, I could set up the same equation (6=I 0.16) and I get 37.5 Amps. Does this sound right? As to me, it seems too small.

Just go to Napa or AutoZone and see if they can order a 6v battery. I would not recommend trying to run it off 12v unless you have a resistor to drop the voltage.

A few weeks ago, I was contacted by Jeb who recommended an 8N Ford tractor battery and its corresponding starter solenoid and push-button start. Hopefully I will purchase said parts soon to give the siren the much-needed love.

I have one of these with a gummed-up motor that barely rotates. I wonder how I could replace it with a 120v motor.