EDIT...Found It Anybody have the picture

[Travis]

That second siren was in Slaton, TX, and was single toned. The unit has since been scrapped, and they now have a decent 16V1TB system in place. I don't know if the SD-10's are still active. Trey could shed more light on that, as he lives there now.

[coop866]

The yellow one and the red one defiantly aren't the same.

[LukeH]

So based on recent posts and that ebay auction I think it is safe to assume the primer red siren is an HOR.

[Daniel]

HOR vertical two-rotor sirens were built in this style, either 10/10 or 7/10. Like Bullards and Heaths, Hedbergs rarely seemed to make it outside California.

[Brendan W]

The yellow one looks like one of those vertical HORs, like the ones that came out of Maricopa Co, AZ's old system

[LukeH]

Someone ought to get a recording, though, I doubt it will ever happen

[500AT]

Like Bullards and Heaths, Hedbergs rarely seemed to make it outside California.

The Willow Run Bomber Plant in Ypsilanti, Michigan, where Henry Ford built his B-24 Liberators had two Hedbergs on the roof of the building. Sadly, they were scrapped, a few years ago. I believe the Federal Model 2s and 3s that were inside the plant were hopefully salvaged. If not, they were demolished with the plant.

[Westgate Thunderbolt]

I am pretty sure that all if the sirens pictured are HOR Si-Rex sirens. Both the Super Si-Rex I had and the 7:10 port omnidirectional Si-Rex I have utilize end rings with the air intake hole that screw to the stator port segments. Also, on the 7:10 the top stator is bolted to the lower stator end ring with large cast lugs. Both of these features are shown in every one of those pictures. https://m.flickr.com/#/photos/58979889@N06/12079141146/

[LukeH]

Like Bullards and Heaths, Hedbergs rarely seemed to make it outside California.

The Willow Run Bomber Plant in Ypsilanti, Michigan, where Henry Ford built his B-24 Liberators had two Hedbergs on the roof of the building. Sadly, they were scrapped, a few years ago. I believe the Federal Model 2s and 3s that were inside the plant were hopefully salvaged. If not, they were demolished with the plant.

Has anybody Ever even seen or taken a picture of a "Hedberg"? all I've seen about them are mentions, never any real pictures

[Chicagosiren-hunters]

This is exactly what I have been wondering for a while as well.