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Introducing Robbie - Class A Discrete Mic Preamp from Blue
Press Release
2004-05-30

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Robbie is a single-channel 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 @ 50Ω) 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 an amazing 34dB headroom before clipping!

MSRP: $1299
MINIMUM GAIN 8 dB
MAXIMUM GAIN 68 dB
FREQUENCY RESPONSE (+ / - 2 dB ) 10Hz - 100kHz
NOISE @ 60 dB gain (10 Hz - 30 kHz, 50Ω source) -131 dB EIN
NOISE @ 60 dB gain (10 Hz - 30 kHz, 150Ω source) -129 dB EIN
THD + NOISE @ 60 dB gain (10 Hz - 20 kHz, +22 dBu output) less than 0.006%
PHASE RESPONSE @ 60dB gain (50 Hz - 20 kHz, +22 dBu output) less than 5 deg
COMMON MODE REJECTION RATIO (50 Hz - 20 kHz, 100 mV input) 60dB gain, greater than 64 dB
30dB gain, greater than 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 kΩ) +34 dBu
MIC INPUT IMPEDANCE (20Hz - 20kHz) 5kΩ (2x 2,5kΩ)
HI-Z INPUT IMPEDANCE 1MΩ
OUTPUT IMPEDANCE 50Ω (2x25Ω)
PHANTOM POWER +48 VDC, +/- 1.5 VDC
POWER CONSUMPTION 8W
POWER REQUIREMENTS 117/240 VAC, 50/60 Hz DIMENSIONS 81/2"L X 81/4"W X 51/4"H WEIGHT 7 LB