Line Magnetic LM-523PA single-ended Class A 300B 805 Mono-block power amplifier(a pair)

Specification:
Rated output power: 50w+50w (single-ended Class A working state)
Frequency response of the whole machine: 20Hz ~ 20kHz (-1.5dB)
Input Impedance: 100kΩ
Output impedance: 4Ω, 8Ω, 16Ω
Power supply voltage: ~220V ±5 % (50Hz)
Overall volume (WxDxH): 287x477x263mm
about the tubes: 
1. 300B ; line magnetic customeized from the Psvane
2. 805 ; line magnetic customeized from the Psvane
3. 274B ; line magnetic customeized from the Psvane
4. 6SN7 ; line magnetic customeized from the Psvane
5. ECC82( 12AUX ); JJ brand