OldChen K1 HIFI KT88 Class A tube Amplifier Handmade Scaffolding DAC/CD output

Manufactuer "LaoChen" have 3 brands name: "Oldchen" , "LaoChen", "Aiqin" 
So for this product, we have some amplifier  maybe  come with "Oldchen" words on the front plate,and others come with "LaoChen",please pay attention.
Basic technical parameters:
Tubes:  1 x Shuguang 5Z3PA rectifier 
        2 x Shuguang 6N8P(6sn7) preamp tubes
        2 x PSVANE KT88  power tubes(KT88 tubes garentie 6 months)
Power transformer :  105*60 0.35mm steel with OFC wires
Output transformer:   86*40 0.35mm Japanese Z11 steel with OFC wires
Output power: 15Wx2
Frequency response: 20Hz-25KHz
Output Impedance: 4 ohm, 8 ohm
Total Harmonic Distortion: ≤ 1% (1kHz)
Input Impedance: 100K ohm
Input Sensitivity: 500mV--2000mV
SNR: 88dB
Supply transformer Power: 150W
Size (W × D × H): 370mm × 240mm × 180mm
Net weight: 15 kg 
Thick double packaged 17.5 kg
Input voltage: 110v-240v  50/60hz
 
Product technology and materials:
Using SPRAGUE or TRW or CE or MALLORY special HIFI audio capacitors
Powoer output transformer is quranty by AIQIN brand
Gold plate connection for all connections
Swith input source
Teflon silver plated wire partially used in main path in the machine
Containing silver soldering
Handmade scaffoldin
CLC filter inductor for rectifier tube