I know this subject may seem to be beat to death but I have a few more questions. I am pretty familiar with the 4A speakerphone system, but what is the difference between the 108, 108A and 108AA speakers? I also have a 107A, a 760A, a 106D, and a 758 A. What is/was the intended function of all of these speakers if that's what they actually are. (Maybe one's a microphone). Why does the 107A have 4 wires (i.e. what are the black and yellow for?) and the 760A only has 2 wires? To top things off, how is the ITT Call Announcer hooked up and can it be hooked up to a WE phone or just ITT phones?

I don't have my files here at work, so I'm going to go on memory. Usually a bad thing at my age, but here goes.

The 107 was, I believe the Orator or Spokesman. It was a speaker designed to let other people in the room hear both sides of the conversation. It had 4 wires because it required external power and the BK/Y pair was designed for that.

An ITT Call Announcer was designed to work with the ITT 76A Key system. This was a conventional 1A2 system with a fancy intercom. You dialed an ICM station and the associated call announcer beeped and then you could converse hands free with that station. The units could also be installed without an associated key set and used as a mini-talkback speaker (in a stockroom, for example).

It was undocumented, but it is possible to hook up a call announcer to any 401 Intercom card and when you accessed the button you could talk handsfree through the call announcer. (I know that works. I have one installed in my house as a front door speaker.) In that sense you could hook up a call announcer to a WE system, but in its normal configuration, No. It requires an ITT 76A system. I doubt that there are any of those still out there.

The rest of your requests will have to wait till I get home, unless someone else with a better memory can pipe up first.

Sam

The 108, 108A and AA are the speaker/amplifier part of the 4A speakerphone system and cannot be used separately. Aside from the 107 being the Orator/Spokesman as Sam said, I really don't remember any of the other models you mentioned.

Ed, I'm disappointed in you and your encyclopedic memory. This is the first time I have ever stumped you. Can you tell me if there is any significant difference between the 108, 108A, and 108AA? Is the 108A the new and improved version of the 108 or are there any other distinctions between them? Same for 107A and 107B. You're surely not going to say the 106D and 760 were before your time, are you?

Got any pictures of these devices? A lot of these units were part of a whole package and it's difficult, if not impossible to id the individual components.

There was a 759, a 761 and a 762 (but not a 760) that were speakers for the WECO 1A home interphone system.

Sam

The 760A was the standard speaker used with (at least) the Western Electric Type 3 speakerphone. This system also required a 55A or 55B control unit, a 2012B transformer, and a transmitter module (which I don't remember the number of).

Physically speaking, the transmitter was about half the height of the speaker with a couple of round/clear buttons on top.

Happy tweaking.

Thanks for the info, all of you. The 107A looks just like the 760A except for the number of cords coming to it if that helps anyone. Does anyone know what voltage and AC or DC the B/Y wires on the 107 are hooked to?

The 2012D transformer will give it the 15-18 volts AC it needs, but I've seen them work perfectly fine on 10 volt lamp battery as well straight from the KSU.