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 Maestro ZR:

- Plitron Torodial Transformer
- Point-to-Point Wiring (no circuit boards)
- (2) 3600μF Reservoir Capacitors
- Uniquely Designed Triode Output TransformerLess (OTL) Circuit Topology
- Multiple Stages of Power Filtration
- (4) Selectable Inputs and (3) Preamp Outputs
- Jensen Coupling Capacitors
- Highly  Regulated Power Supply 
- High Quality Volume Control
- Silver Ceramic Tube Sockets
- Silver Wire w/Teflon
- Silver Solder
- Vishay Metal Film Resistors
- OFC Shielded Wire (signal path wiring)
- Precision Machined Aluminum Chassis
- Filtered and Rectified DC Tube Filament Voltage