You can here the cp mxl-v/cpv-90 beep tone here. https://youtu.be/UkTq_VRNvbk?si=Nk4JduMuW-KZBue1
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Before 911, buildings most likely had desk mounted CPV-90 systems in both lobbies, since the CPV-90 didnāt come out until 1980/1981 or so. And before Pyrotronics came out with voice systems for the World Trade center, the towers most likely had system 3 - (etc analog systems). Since the system 3 did not come out until 1970/71 or so, since the buildings were just being finished then in the early 70s. Buildings most likely used mechanical horns provided by wheelock as seen in the safety video.
I found out more about this system.
The panel I drew wasnāt actually a fire alarm panel, but rather a control panel for the heating in the building. In this part of the school there was an old Siemens SRS 20 FACP. What I thought was a telephone is actually an emergency switch. There is also a temperature display at the top of the panel instead of the fire lettering as an illuminated scroll band in red.
The fields directly below the temperature display are buttons for selecting a room for temperature adjustment.
The three buttons below the room buttons are used to change the temperature.
The four boxes next to the switch are pictures where you can see a map of the school and see which button was for which room.
The interesting thing about this panel is that it works almost entirely with relays. So even if itās not a FACP, itās still a very, very interesting panel.
Now for the more interesting part: I learned more about the sound in my video. It is generated by two tone generators from Dynacord. They are the exact same model that my other school had, but they are set to produce a continuous whoop sound. Then the panel switches between the two tone generators, like in this video. A mall in this city also has a super old Siemens SRS 60 system with another Dynacord voice evacuation system that also switches between the same two tone generators during continuous whoop. But this system also has a pre-alarm chime generated by a Dynacord EG-410 (the same one my last school had with the Esser system for the normal class change gong with a continuous chime like in this part of the video. After the whoop tone there would play a pre recorded message over a tape recorder very similar to this simplex one in the latest Techmoan video. Makes me wonder if this was once a fire safety requirement in the city for high occupancy buildings, as I havenāt seen anything like it anywhere else in Germany.
I hope to be able to take detailed pictures of these systems soon, but now that Iām back at work, I donāt have much time left with the fire alarm technician I used to service these systems with.
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No thats not true sir
Theres a picture on an old govāt document showing some old system 3 cabās. I think they were red
Iāve seen that picture before. Those are most likely the panels like I said before the voice system came out for the building. Or otherwise sprinkler panels.
are you from germany?
The firecom 8500 has finally been found
and here is the video https://www.youtube.com/watch?v=OV5Igf9FWt4&t=180s
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Yessiree (though according to someone the last photo is of something else thatās not related to the 8500 or even fire alarm systems in general I think).
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That amazing! Iām curious where did you find the images from?
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Someone else posted them in another topic (forget who & which respectively though).
Looks like the 8500 had old computer displays
There are some other variations of the 8500 as i think
Firecom rebranded panels from California fire alarm in 1986 when it was released
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Iām not sure if any of what you just said is true: where did you get this info from?
As I & whoever originally posted the image said, that last photo is supposedly not of an 8500.
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It might be an emergency communication system or an emergency phone system for the elevators. In the video it looks like itās next to an elevator lobby/annunciator panel.
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I donāt exactly know. Iām not exactly sure, but I think I remember something about that, but I donāt exactly know where I was, I might be wrong though
They likely rebranded the aip ai270 pulls because the aip company. Basically no brand, which means it could be rebranded by other companies and be put under other names
Voice evac panels that would have been in the twin towers pre 1993
All of these are cpv-90s which would have most likely been in the twin towers before 1993. These panels piggybacked off an xl3/system 3. The cpv-90 was basically the pre mxl-v released in 1984. And also the 9/11 pa message video actually used this tone on the fire panel: Pyrotronics CPV-90? - #2 by randomperson this message is the same message that the cpv-90 uses.
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