Recorded on Saturday, June 24th, 2023. This is a video of GSPiedmont425's 4/5 Thunderbolt 1000BT sounding for its first full run with blower. This siren is VERY LOUD! One of the loudest Thunderbolt's I have ever heard. The other siren you can hear in this video is SouthCarolinaSirens' Whelen Vortex R3 running for its weekly test. This siren's chopper is set on termimal 4 (Note: they did not change the chopper terminal level before the attack test.) GSPiedmont425 owns this 4/5 Thunderbolt head, while the blower is SouthCarolinaSirens' Thunderbolt 1003's blower. GSPiedmont425 bought this siren recently. This siren came from West Shore Services in Allendale, MI. I met up with GSPiedmont425, SouthCarolinaSirens, and WSProductions.

Siren: Federal Sign and Signal Thunderbolt
Model: 1000BT (head was converted from a 1000AT to 1000BT)
Year: 1957 or 1958
Port: 4/5
Chopper Termimal 4
Blower: Series A2 4M
Siren Control Timer: FC

Recorded by:
Canon Rebel EOS T7 1500D
Panasonic HC-V180K