Note: this is DIY kits. Need the buyer to weld himself.
This is a 2.0 channel price, 2 PCS kits . Mirror symmetrical design .
input tube uses ON 2N5551/5401, amplification tube and power tube use ON MJ15032/33, MJL1302/3281.
increase Load the midpoint voltage: within 30MV
Signal-to-noise ratio (100Db, not A-weighted), full power distortion less than 0.01%.
Strict standard selection/pairing components;
Instrumentation: digital bridge, 6 half-multimeter, capacitance tester, transistor tester, audio analyzer;
Push level quiescent current up to 130mA, when debugging must be installed on the radiator for debugging
About power supply: Use two 300w transformers, and use two voltage segments, 8 Europe: AC40V; 4 Europe: AC35V;
About the radiator: 115*80mm, finished board 140*112mm; This board has large quiescent current, at least 2kG radiator per channel.
The board debugging method: first adjust the input "DC" point potential to 0mV, and then adjust the output to within 50mV; the whole machine has only one adjustable resistance, adjust the output midpoint. Daxiao is a full-DC and no-negative feedback architecture. The midpoint drift will be slightly larger than the normal amplifier. Positive and negative 100mV are normal phenomena. The original machine is the same and needs regular adjustment.