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ST-TC1
Telephone System Coupler - CO Line Simulator
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ST-UBA2
Unbalanced to Balanced Amplifier - 2 channel
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ST-UMX3
3x1 Universal Audio Mixer - 3 microphone or line inputs x 1 microphone or line output
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ST-VCA3
Voltage Controlled Amplifier
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ST-VOX1
Voice Operated Relay
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ST-VP1
Voice-Over / Paging Module - Manual
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ST-VP2
Automatic Ducking Module
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STA-1
Dual Balanced/Unbalanced Line Amplifier -12 to 20 dB Gain
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STA-1M
Audio Line Amplifier - Mono: -14 to 14 dB Gain
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STA-2A
Dual High Gain Line Amplifiers
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STD-10K
Passive Audio Divider/Combiner - 10 kΩ
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STD-150
Passive Audio Divider/Combiner - 150 Ω
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STD-600
Passive Audio Divider/Combiner - 600 Ω
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STM-1
Microphone Preamplifier - 50 dB Gain
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STM-2
Adjustable Gain Microphone Preamplifier - 35 to 65 dB Gain
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STM-2X
Switched Microphone Preamplifier - 35 to 65 dB Gain
