Western electric 124 f schematic

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Wes/2m fleclric Company
No. | 24-F AMPLIFIER

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Western Eledric Company
No. l 24-F AMPLIFIER

The 124F is a dual purpose three stage high quality Monitoring Amplifier
for operating loud speakers. It has two input circuits each with its own gain
control. One input is for line or bus level inputs with facilitim for 600 ohm
matching or for bridging connection. The other input is for low level sources
such as a microphone. The amplifier has self-contained power supply for oper-
ation from AC.

Typical Electrical Characteristim
Gain-Line Input: 60 db (600 ohm Matching Connection)
47 db (20000 ohm Bridging Connection)
Low Level Input: 104 db
Gain Control-Line Input: 20 db in 1 db steps
Low Level Input: 35 db continuously adjustable
Frequency Characteristics-Uniform within i 1 db over the range 55 to
15000 cycles
Operates from Line Input: 600 ohms Nominal impedance (Matching or
Bridging)
Low Level Input:- 15 to 250 ohms(SeeExternal Connections)
Operates into 1 to 1200 ohms nominal impedance
Output Power: 12 watts as shipped, 20 watts available
Output Noise: 8 db below .001 watt, unweighted, under maximum gain
conditions (signal approx. 50 db above noise)
Power Supply: 105-125 volts, 5060 cycles 1.25 amperes, 125 watts max-
1mum

Apparatus Description
Dimensions-19»5/32 inches wide, 7 inches deep and 7 inchfi high (Panel
Space)
Weight-Approximately 20 pounds
Finish-Chassis-Bright Aluminum lacquer
Mat-Black Japan, coded 124F~3
Dark Aluminum Gray, coded 124F-15

Instruction Bulletin No. 1100P

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