BSP references for the 1A Speakerphone are listed in the table of 500-Series Telephone Types.
|Western Electric 592
Telephone -- Uses a
in the lower right corner of the base and a separate 758 speaker.
This set also includes a WE549B metal 4-button box for
Set bottom is marked 592B 2-55. Case is 'soft plastic'
In those days, they couldn't fit all the works in the phone base (see below).
||Detail showing front controls
and microphone grille.
VOL sets the speaker volume.
ON changes to "distant talking" (speakerphone) mode.
OFF changes to handset mode.
Detail with plastic trim removed, showing the metal grille
protecting the 'microphone.'
Detail with case removed, showing the 'microphone' is a
standard U1 element. Yes, this is the same element that is used
as a receiver in G-series handsets.
Here's the control unit at the end of the cords from the phone and speaker, with the plain gray cover removed.
Marked: WE KS 14964 L2 Control Unit, 115 volts 60 cycles 8 watts.
9' x 6.5" x 5", 9 pounds. How transistors have
Imagine mounting this on the wall or under your desk.
1A and 1A1 Speakerphones
1A Speakerphone uses KS 14964 or KS 14964 L2 control.
1A1 Speakerphone uses KS 14964 L3 or KS 16162 L2
control. This provides "12-db increase in
receive volume and reduces far-end talker echo under most conditions."
|Here's a 1A speakerphone
using a 500S phone and seperate transmitter (656A)
instead of the 592 integrated set.
It uses the same type speaker (758A) and KS 14964 L2 Control Unit.
All the components in this set are dated during 1957 and desktop components are in soft plastic rose beige.
The BSPs also show connection diagrams for keysts, 211 "hang-up" sets and other sets.