If I recall correctly the story behind this siren is the chopper motor died at one point and was repaired with the wrong part. Either the armature or field was replaced with one from a 120V Model 2. As a result the motor was getting way more voltage than it needed, and that combined with the reversed blower is what was causing it to run so high in pitch. It was probably on level 5 or 6 before the work was done to the head.
I haven't made any posts about yet, but I recently acquired a 2-120 and accidentally ran it briefly on 240VAC replicating this by mistake. Since it's a 120V siren, it would draw a lot of amps. The circuit I was using for the Model 1 is in a 20 amp breaker, which was originally a 15 amp circuit before my grandparents had it swapped years ago due to the Christmas lights popping it whenever they'd use the microwave since they were on the same circuit. I bought a stepdown transformer so I could run it on our 240V heat pump circuit to give it breathing room and avoid tripping the breaker, but when I tested it for the first time I mistakenly set the transformer to 120V. This let 240V flow into the 120V receptacle and to the siren resulting in it spinning WAY faster than it should and blowing up the USB side of the transformer. It hit almost the same pitch as the aforementioned Thunderbolt. Thankfully I shut it off before damage could be done. Of course I got it all on camera and had to post it online
https://youtu.be/n0ADRA40X5I?si=KTfMJegCqeQGPshd
