Specifications:

Input impedance: 100K ohm
Output Impedance: < 20 Ohms
Power supply capacitance: 215 uF
Rectification: silicon
Power output < 0.5 watts
Usable headphone range: 16 to 2000 ohms.
Total distortion < 0.1%
Volume control: Noble
Input RCA: Gold Plated Teflon insert
Output Headphone Jack: Neutrik Standard Chrome Nose
Milled aluminum Knob
1/8" thick aluminum chassis

Standard Features of the Supra:

- 800v Center Tap Power Transformer (229VA)
- Point-to-Point Wiring (no circuit boards)
- (2) 3600μF Reservoir Capacitors
- GoldPoint Stepped Attenuator (24 Steps)
- Output TransformerLess (OTL) Circuit Topology
- Jensen Coupling Capacitors
- 6SN7 Tube Compliment
- Highly  Regulated Power Supply 
- Multiple Stages of Power Filtration
- Silver-Ceramic Sockets
- Silver Wire w/Teflon
- Silver Solder
- Metal Film Resistors and High Quality Components Throughout
- OFC Shielded Wire (signal path wiring)
- Stainless Steel Chassis w/ 360 Degree Ground Plane
- Filtered and Rectified DC Tube Filament Voltage