3T22 with stuck damper?

[ACAP10]

http://www.youtube.com/watch?v=HzScsU8iVoI

or is it something else?

[FedSig-Kid]

It sounds like a stuck damper... yet at some times it sounds like a whole different siren.

[Jpressman8]

It sounds like the high side damper is stuck closed.

[weasel2htm]

Almost sounds like a Sentry at first.
That distinctive 3T22 sound is just itching to get through

[Archon]

Sounds like the sprng is off the 12 port side and it is flapping open and closed

[Modulator Master]

Ebensburg Aka the Dauntless Fire Company has a 3T22 like this behind their station.
As shown in this video.
http://www.youtube.com/watch?v=nwhpCpCMJW4
Btw there is a blue Sterling siren along with a blue STH-10 but they can't be heard.

[Thunderboltlover]

That is indeed a stuck damper on the top of the siren.

Probably a broken return spring.