Blue Microphones Robbie Single Channel Tube Preamp Details

The Blue Microphones Robbie is a Class-A discrete tube microphone and instrument preamplifier. With no ICs and only the highest-quality discrete components from input to output, Robbie is one of the quietest (-131 dB EIN @ 50 Ohms) and most detailed (THD 0.006%) tube preamps available today. It features audiophile-grade ultra low noise metal film resistors and polystyrene capacitors, and provides the user with the best of both worlds: An electronically-balanced, fully discrete input stage, tube gain stage (ECC88 twin triode), and an electronically-balanced solid-state output stage. There is no switching crossover distortion anywhere in the completely balanced audio signal path. And if that’s not enough, Robbie achieves and amazing 34dB headroom before clipping!

Elegance and simplicity are the driving forces behind Blue's design philosophy. Robbie is no exception. The front panel features only a large backlit potentiometer (gain) and 1⁄4 hi-Z instrument input. On the back, you’ll find the power cable input, power switch, balanced XLR mic input, balanced XLR line output, polarity switch, -20 dB pad, input selector switch (mic/instrument) and phantom power on/off.

Blue Microphones Robbie Single Channel Tube Preamp Features

• Very quiet design - -131 dB EIN @ 50 Ohms
• Extremely detailed sound - 0.006% Total Harmonic Distortion (THD)
• Microphone and Instruments Inputs
• Audiophile-grade ultra low noise metal film resistors
• Audiophile-grade polystyrene capacitors
• +48V Phantom Power
• Electronically-balanced, fully discrete input stage, tube gain stage (ECC88 twin triode), and an electronically-balanced solid-state output stage
• No switching crossover distortion
• Completely balanced audio signal path - a rarity that sounds fantastic!

Blue Microphones Robbie Single Channel Tube Preamp Specifications

• Minimum Gain: 8 dB
• Maximum Gain: 68 dB
• Frequency Response (+ / - 2 dB ): 10Hz - 100kHz
• Noise @ 60 dB gain (10 Hz - 30 kHz, 50 Ohm source): -131 dB EIN
• Noise @ 60 dB gain (10 Hz - 30 kHz, 150 Ohm source): -129 dB EIN
• THD + Noise @ 60 dB gain (10 Hz - 20 kHz, +22 dBu output): < 0.006%
• Phase Response @ 60dB gain (50 Hz - 20 kHz, +22 dBu output): < 5 Ohms
• Common Mode Rejection Ratio (50 Hz - 20 kHz, 100 mV input): 60dB gain > 64dB; 30dB gain > 75 dB
• Maximum Input Level (8 dB Gain, 20 Hz - 20 kHz): +22 dBu w/o pad
• Maximum Output Level (20 Hz - 40 kHz @ 10 kOhms): +34 dBu
• Mic Input Impedence (20Hz - 20kHz): 5k Ohms (2x 2,5k Ohms)
• HI-Z Input Impedence: 1 MOhm
• Output Impedence: 50 Ohms (2x25 Ohms)
• Phantom Power: +48 VDC, +/- 1.5 VDC
• Power Consumption: 8W
• Power Requirements: 115/230 VAC, 50/60 Hz
• Dimensions: 81/2'L X 81/4'W X 51?4'H
• Warranty: 3-Years

Blue Microphones Robbie Single Channel Tube Preamp Downloads

• Blue Microphones Robbie Tube Mic Pre Manual (PDF)

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