HeadAmp Blue Hawaii Special Edition Electrostatic Headphone Amplifier

In working condition  Key Specifications: Type: Hybrid (Solid-State Input, Vacuum Tube Output) Tube Complement: 4x EL34/6CA7 Frequency Response: 5Hz - 20kHz +/- 0.3dB Total Harmonic Distortion (THD): 0.003% @ 1kHz/100VRMS Gain: 54dB (500x) Input Impedance: 50kΩ Output Voltage: 1600V peak-to-peak Stax Pro Bias Output: 580V Inputs: 1x XLR, 2x RCA Outputs: 2x Stax Pro Bias (580V), 1x XLR Loop, 1x RCA Loop Power: 180W Consumption; External Power Supply Volume Control Options: DACT 24-Step or ALPS RK50 Stepless (upgraded) Dimensions (Amp): Approx. 15.5"W x 13.5"D x 8.5"H Weight (Amp/PSU): Approx. 14 lbs / 17 lbs  Key Features: Hybrid Design: Uses low-noise JFETs for input stages and EL34 tubes for powerful output. Separate Power Supply: An external, noise-reducing power supply connects via an umbilical cord. Dual Outputs: Accommodates two electrostatic headphones simultaneously. Choice of Legs: Comes with aluminum spike legs or rubber isolation feet. Loop Outputs: Provides XLR and RCA loop-through for connecting to other audio gear.