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Radial Engineering Firefly

Tube DI, 2-inputs, class-A,12AX7 tube drive, transformer isolated output

Free Tech Support

$629.99

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Description

The Radial Firefly™ is a high output tube direct box designed for stage and studio. It combines Radial's award winning zero negative feedback class-A front end with the warmth and character of a 12AX7 tube drive circuit and Radial's legendary transformer coupled output.

The Firefly features A and B instrument inputs with easy access level controls to accelerate instrument changes on stage. This enables the artist to switch between two different instruments and deliver a consistent signal to the PA system and on-stage amp. Switching can be done via the front panel or with the optional JR2 remote control. This connects to the Firefly using a balanced cable and adds a mute function for quiet on-stage adjustments.

To optimize performance with electric bass, the Firefly is equipped with Drag Control™ load correction that lets you adjust the load on a magnetic pickup so that it 'feels' as if connected to a tube amplifier. For 'fussy' piezo transducers, Drag can be bypassed to increase the input impedance to 4 meg-ohms to eliminate the squawk and peaks that plague these types of pickups. A fully variable high-pass filter may be dialed in to eliminate low frequency resonance that can cause feedback on stage or muddy sound when recording.

The rear panel sports two stacked ¼" instrument A & B-INPUTS and a THRU output for the on-stage amp. The THRU offers a choice of pre or post tube configuration. Additionally a TRS insert jack enables external effects to be shared between both inputs. A buffered 'always on' tuner output can be used to split the instrument signal in the studio or it can be dedicated to an electronic tuner. The tuner output can be used for silent tuning when the optional JR2 remote is connected. The balanced XLR output is equipped with a ground lift switch to help eliminate buzz and hum caused by ground loops and a 180° polarity reverse to tame feedback hot spots on stage or help phase align the PA system with the on-stage amp. The Firefly may also be rack mounted alone or in pairs by ordering the optional 19" rackmount kit.

The Firefly combines the warmth, character and feel of a vintage tube device with the low noise and performance of today's most advance audio technology.

Features

Drag Control load correction for optimal tone

Two inputs with separate gain & remote switching

Class-A front end drives 12AX7 tube stage

Variable high-pass filter to eliminate resonance

Specs

TypeAudio circuit type: 100% discrete class-A FET with tube drive
Input Connections2x Hi-Z 1/4" connectors, selectable A or B
PadYes, variable input pad
Output Connectors1x balanced XLR 1x 1/4" Hi-Z buffered, pre or post tube & effects insert loop
InsertsYes, 1/4" TRS insert loop, wired tip-send, ring-return
Polarity180°
GroundGround Lift: Pin-1 at the XLR
Gain20 dB (Maximum)
Signal to Noise Ratio85 dB @ +4 dB
Dynamic Range>100 dB
Controls2x Trim Knobs 1x A/B Select Button 1x Drag On Button 1x Low Cut Knob 1x Level Knob 1x Load Adjust Terminal 1x Recessed Polarity Switch 1x Recessed Ground Lift Switch 1x Recessed Pre Switch
MuteYes, on all outputs except Tuner (requires separately available JR2 footswitch)
Low Cut FiltersVariable from 5 Hz to 500 Hz at -3 dB
Drag ControlYes, load correction for magnetic pickups
Frequency Response20 Hz to 20 kHz
Noise Floor-98 dB at unity gain
Equivalent Input Noise-101 dB
Maximum InputVariable from -12 dB to +20 dB
Total Harmonic Distortion0.15% from 20 Hz to 20 kHz
Intermodulation Distortion0.3%
Input ImpedanceDrag On: Variable 22k to 500k Drag Off: 3.9 meg-Ω
Output Impedance150Ω (nominal)
Power5-pin XLR, +/-16V & 48V, 1600mA
Specialties12AX7 Tube drive circuit
DimensionsWithout handle: 5.75 x 8.25 x 1.75" (146 x 210 x 45 mm) With handle: 5.75 x 8.25 x 2.75" (146 x 210 x 70 mm)
Weight3.95 lb (1.80 kg)
Package Weight6.65 lb
Box Dimensions (LxWxH)13.6 x 8.8 x 4.7"
TypeAudio circuit type: 100% discrete class-A FET with tube drive
Input Connections2x Hi-Z 1/4" connectors, selectable A or B
PadYes, variable input pad
Output Connectors1x balanced XLR 1x 1/4" Hi-Z buffered, pre or post tube & effects insert loop
InsertsYes, 1/4" TRS insert loop, wired tip-send, ring-return
Polarity180°
GroundGround Lift: Pin-1 at the XLR
Gain20 dB (Maximum)
Signal to Noise Ratio85 dB @ +4 dB
Dynamic Range>100 dB
Controls2x Trim Knobs 1x A/B Select Button 1x Drag On Button 1x Low Cut Knob 1x Level Knob 1x Load Adjust Terminal 1x Recessed Polarity Switch 1x Recessed Ground Lift Switch 1x Recessed Pre Switch
MuteYes, on all outputs except Tuner (requires separately available JR2 footswitch)
Low Cut FiltersVariable from 5 Hz to 500 Hz at -3 dB
Drag ControlYes, load correction for magnetic pickups
Frequency Response20 Hz to 20 kHz
Noise Floor-98 dB at unity gain
Equivalent Input Noise-101 dB
Maximum InputVariable from -12 dB to +20 dB
Total Harmonic Distortion0.15% from 20 Hz to 20 kHz
Intermodulation Distortion0.3%
Input ImpedanceDrag On: Variable 22k to 500k Drag Off: 3.9 meg-Ω
Output Impedance150Ω (nominal)
Power5-pin XLR, +/-16V & 48V, 1600mA
Specialties12AX7 Tube drive circuit
DimensionsWithout handle: 5.75 x 8.25 x 1.75" (146 x 210 x 45 mm) With handle: 5.75 x 8.25 x 2.75" (146 x 210 x 70 mm)
Weight3.95 lb (1.80 kg)
Package Weight6.65 lb
Box Dimensions (LxWxH)13.6 x 8.8 x 4.7"

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