Behringer 676 Tube Microphone Preamplifier FET Compressor Rack Processor Behringer 676 is a tube microphone preamplifier and FET-style compressor designed for studio recording, mixing, and broadcast signal processing. It enables microphone, line, and instrument signal amplification with integrated dynamic control for recording engineers and production environments. This makes it ideal for studio signal chains where tube preamplification and compressor control are required. The unit combines a vacuum tube preamplifier stage with a FET-style compressor in a single rackmount processor. Transformer-balanced inputs and outputs, tube amplification stages, and switchable equalization allow integration into recording and mixing workflows. In practical operation, the preamplifier and compressor sections can function independently or together within a signal chain. Its control architecture supports microphone recording, instrument processing, and studio outboard compression applications. Key Features Tube Microphone Preamplifier: Vacuum tube microphone and line preamp stage based on classic studio designs FET Style Compressor: Integrated compressor circuit modeled after classic FET compressor architecture Midas Transformers: Custom-built transformer-balanced input and output stages Selectable Input Sources: Microphone, line, and Hi-Z instrument input options Tube Circuit Design: Uses 12AX7/ECC83S and 12AT7/6072 vacuum tubes for signal amplification Two Band Shelving Equalizer: Integrated EQ section with selectable frequency filters Flexible Signal Routing: Preamplifier and compressor sections can operate independently or together Vintage Style Metering: Analog meter displays gain reduction or output level Rackmount Construction: Two rack unit chassis designed for studio racks and portable installations Universal Power Supply: Auto-ranging switch-mode power supply supports global mains voltages Technical Specifications Audio Inputs Mic Type: XLR, transformer balanced Impedance: 500 Ω / 2 kΩ Max input level: +14 dBu pad in, -1 dB pad out CMRR: Typically > 90 dB @ 1 kHz, maximum gain Frequency response: 20 Hz - 20 kHz ±1 dB EIN noise at maximum gain: -122 dBu, 22 Hz - 22 kHz unweighted Distortion (THD+N): 80 dB @ 1 kHz, unity gain Frequency response: 20 Hz - 20 kHz ±1 dB Noise at unity gain: -79 dBu, 22 Hz - 22 kHz unweighted Distortion (THD+N):
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