Linear Tube Audio Z40+ Instructions Manual page 4

Specifications
Circuit Type: Push-Pull Class AB
Speaker Output: 51W (4 Ohm), 46W (8 Ohm)
Input Sensitivity: 0.6V RMS for full output
Input Impedance: 50K
Output impedance: 1.6 Ohms
Gain: 23dB (8 Ohm load)
Noise: -94dB
Frequency Response: +0, -0.5dB, 6Hz-60kHz (8 Ohm Load)
THD: 0.5%
Input Voltage Universal
Tube Complement: preamp: (2x) 12AU7
power: (2x) 12AU7, (2x) 12AX7, (4x) EL34 or KT77
Size: W: 16" (40.6cm), H: 5.125: (13cm), D: 17" (43.18cm)
Shipping Weight: 28 lbs (12.7kg)