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109A Loudspeaker

109A Loudspeaker ; Western Electric (ID = 2266914) Speaker-P 109A Loudspeaker ; Western Electric (ID = 2266915) Speaker-P
109A Loudspeaker ; Western Electric (ID = 2266917) Speaker-P 109A Loudspeaker ; Western Electric (ID = 2266913) Speaker-P
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109A Loudspeaker ; Western Electric (ID = 2266914) Speaker-P
Western Electric: 109A Loudspeaker [Speaker-P] ID = 2266914 1400x1695
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For model 109A Loudspeaker, Western Electric Company Inc.; New York (NY):
Front view showing left side and bottom (with knobs).
 
Country:  United States of America (USA)
Manufacturer / Brand:  Western Electric Company Inc.; New York (NY)
Year: 1975 Category: Loudspeaker, headphone or earphone
Semiconductors (the count is only for transistors) 4:
Main principle Audio-Amplification
Wave bands - without
Details Loudspeaker + integr.Amplifier
Power type and voltage Direct Current supply (DC)
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 16 cm = 6.3 inch
Power out
from Radiomuseum.org Model: 109A Loudspeaker - Western Electric Company Inc.;
Material Wooden case
Shape Miscellaneous shapes - described under notes.
Dimensions (WHD) 240 x 270 x 130 mm / 9.4 x 10.6 x 5.1 inch
Notes

This loudspeaker with integrated amplifier was part of the Western Electric 4A (COM KEY 416) communication system.  Per the Bell System Practices (BSP) Supplement 518-450-105, Issue 1, June 1975:

"The loudspeaker set (Figures 9, 10, and 11) includes speaker, amplifier, and two volume controls in a wood housing designed for wall mounting.  They are intended for typical indoor business offices and not outside or high noise level environments.  Customer-accessible individual volume controls are provided for background music level (right control) and page level (left control)."

The 109A uses an IC op-amp labeled "502A" which drives a push-pull output stage (66G NPN and 51A PNP transistors).  Although the BSP does not indicate the supply voltage for the 109A, it does show that the 4A system runs on 24 VDC.  The 109A has a 75uF capacitor rated at 30 VDC across the input power leads, consistent with 24 VDC operation.  The amplifier works well with a power supply of 12 VDC or more.  The 51E, like the 51A is a PNP transistor.

Net weight (2.2 lb = 1 kg) 5.5 lb (5 lb 8 oz) / 2.497 kg
Mentioned in - - Manufacturers Literature (Bell System Practices (BSP) Supplement 518-450-105, Issue 1, June 1975)

Model page created by Gary Brandenburger. See "Data change" for further contributors.



All listed radios etc. from Western Electric Company Inc.; New York (NY)
Here you find 153 models, 128 with images and 28 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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