Firefly™ Specifications

When viewing specifications, one has to differentiate between products that are designed to provide accuracy versus those designed to color and enthral. The Firefly falls into the second category. Therefore the specifications that are normally used to qualify 'accuracy' have been omitted leaving those that are still relevant such as noise. One must also consider that tubes are inherently noisy compared with solid state devices, so even here, the specs may seem less than ideal. But tubes bring a sonic character that excites. With the Firefly... one must really listen to appreciate.

H-Amp Block Diagram
H-Amp Block Diagram
Click to enlarge
Specifications  
Specifications are subject to change without notice.
Audio circuit type 100% discrete class-A FET with tube drive
Frequency response: 20Hz ~ 20kHz
Gain: 20dB (Maximum)
Signal to noise ratio: 85dB @ +4dB
Dynamic range: >100dB
Noise floor: -98dB at unity gain
Equivalent input noise (EIN): -101dB
Maximum input: Variable from -12dB ~ +20dB
Total harmonic distortion: 0.15% from 20Hz ~ 20kHz
Inter-modulation distortion: 0.3%
Input impedance - Drag On: Variable 22k ~ 500k
Input impedance - Drag Off: 3.9 meg-Ω
Output impedance: 150Ω (nominal)
Features  
Inputs: Selectable A or B with standard hi-Z 1/4" connectors
Input pad: Variable
Mute: All outputs except tuner, requires JR2 footswitch
Low-cut filter: Variable from 5Hz ~ 500Hz @-3dB
Drag Control: Load correction fro magnetic pickups
Aux output: Hi-Z buffered, pre or post tube & effects insert loop
Insert loop: 1/4" TRS insert wired tip-send, ring-return
Polarity: 180°
Ground lift: Pin-1 at the XLR
XLR configuration: AES standard: pin-1 ground, pin-2 (+), pin-3 (-)
General  
Power: 5-pin XLR, +/-16V & 48V, 1600mA
Construction: 14 guage steel
Finish: Durable powder coat
Size: 5.75" x 8.25" x 1.75" (2.75" with handle) 146mm x 210mm x 45mm (70mm with handle)
Weight: 3.95lbs. (1.80kg)
FCC approval Complies with section 15 of the FCC Rules
Conditions: For indoor use at temperatures between +5° c and +40° c
Warranty: 3 years, transferable