Section 5: Filament Supply Section - Audio Note Interstage Mono Block 300D Instruction Manual

Section 5: Filament Supply Section

In this section we are going to build the Filament Supply Board – this PCB basically takes in the AC voltage from the
secondary's (7vAC) and converts it to 5V DC for the 300B valve bases.
4 CAPACITOR
2 Bridge Rectifier
2 LM1084 Adjustable V Regulator
2 110R
2 330R
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4700uF 16V
KBU6J
LM1084 ADJ
R2,R4 300B Filament 5V
R1,R3
The Electrolytic capacitors are installed with the STRIPE on the negative side of
the PCB.
You will note on the PCB you can see a + sign denoting the positive side of the
electrolytic capacitor – The side of the capacitor with the strip denotes the
negative side of the cap –
The capacitors should be installed as shown in the photo opposite.
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