Power supply circuit
Assembly of the left circuit
diagram part.

Parts placed on the universal board
Rectifier circuit assembled by the
diode , capacitor and resistor.

Cathode bias,Coupling circuit
Assembly of the left circuit
diagram part.

Parts placed on the universal board
Cathode bias circuit and coupling
circuit assembled by the resistor
and capacitor

Decoupling circuit
Bias circuit
Assembly of the left circuit
diagram part.

Parts placed on the universal board
Decoupling circuit and bias circuit
assembled by the electrolytic
capacitor,and resistor

Bias,Coupling circuit
Assembly of the left circuit
diagram part.

Parts placed on the universal board
Bias circuit and coupling circuit
assembled by the resistor and
capacitor,electrolytic capacitor