Current Source Loaded Grounded Cathode Amplifier" based design, Vacuum Tube single ended stages, Class-A single ended configuration Zero feedback, Low output impedance, Low current design, Relay-controlled input selector, Power supply rectification using ultra fast-soft recovery Stealth Diodes (2) ECC82/12AU7 tubes, 14dB gain, Frequency Response 10Hz - 500kHz, RCA type inputs & output, 4 line inputs, 1 input can be configured for HT bypass, Input Impedance >100 kOhm, 1 pair preamplifier output, 2nd pair of pre outs optional, Preamplifier output impedance: 10 kOhm, High quality Alps potentiometer, Remote control volume option available, >16 lbs weight / >7.25 kg, Dimensions: 18 width x 8 deep x 4 height (in) /45.7 width x 20.3 deep x 10.2 height (cm)