atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems 760 speaker

Since this topic started with obscure speakers, does anyone know what the 758A dated 9-55 is? Is it a speaker or microphone (small enough to be microphone)?

I can't find any reference to a 758A. Got any pictures?

Sam

The 592 tel set uses the 565 form factor, equipped with the guts of (roughly) the 666-type transmitter as used in the 3-type speakerphone system.

The 758A is the speaker that goes with it.

Arthur -

You're the best!

In 40+ years in the business (most in NYC) I've never seen that phone - and I've seen some strange ones.

Sam

I saw a picture of this on the internet and this predated the 3A and 4A speakerphone systems. Here's a couple more questions: I read somewhere that the 694 speaker and 666 microphone went with the 3A speakerphone and the 760 speaker went with the 3B speakerphone. Is this what you all recall? Also I know Ev has told us the difference between the 760 and the 107, but what is the real difference between them? They appear to have come off the same assembly line but just are stamped with a different number on the bottom. Now I have seen variations of both with 4-wire requiring AC input and on-off switches and volume control, but still I wonder what was the functional difference between the two?

Not quite correct...

The 3A and 3B types of speakerphone used the same components. The 55-type control units were the difference. Anytime the Bell System improved a product that would still work with older versions, they incremented the alpha character which appears after the numeric.

Both the 3A and 3B types used the 760-type speaker. It was just that...a speaker in a plastic housing. Yes, the housing for a 107 is exactly the same as the housing for a 760, but that is not anything more than good planning.

The guts are entirely different:

The 760 is just a speaker. It is driven by the amplifier inside the 55-type speakerphone control unit. The 107 is a speaker and an audio amplifier...a monitoring unit that is wired in parallel with the receiver leads of its associated tel set.

The 694 is a part of the 2B Business Interphone System, which is a selective intercom system that is similar in operation to the ITT Call Announcer System. It is larger than the 107/760 units, and has two rotary controls.

*************

Sam, in 1965, you could have bought a 592 tel set from GrandCom on West 35th Street, just off of 6th Avenue. It sat on their shelves for years, with no takers. Recently, one on Ebay sold to a friend of mine (a former Gene Silvers protege) for $1700.00.

Great, thanks, Arthur for this clarification!

Arthur -

There's a few blasts from the past. Of course in 1965 I couldn't have afforded it - no matter what it cost. I was still in High School and working stock and delivery at Lovell's Pharmacy, two days a week, 4 hours a night for $1.25 an hour. I would splurge my earnings at the recently opened Di Fara's pizza (Still open and consistently voted the best in NYC) and at Artie's Poolroom (long since closed down).

Gene Silvers......I haven't seen him since 1977.I haven't heard of him in almost as long. He may still owe may a paycheck or two. I can't remember. :confused:

Sam

Ok, so no one has answered my question about a 106 speaker. I read that it was designed to be connected to a 3xx switching system whatever that is, never to a CO line. Can anyone enlighten me on what the 106 is used for?