Section 5: Building And Installing The Filament Board - Audio Note Mono Block 300b/2A3 Instruction Manual

Section 5: Building and Installing the Filament Board

We are now going to build the Filament Board for the Mono Block Kit.
The Filament Board takes the AC voltage from the Secondary of the Mains transformer and converts it to the correct DC
voltage that the Tubes require. We are using the LM1084 Voltage regulator, which is actually adjustable – by setting the
resistor values R1 & R2 we can set a particular voltage. Therefore the individual values of these and other components
vary depending on the particular configuration of amplifier that you are building - please refer to the parts list tables below
and identify your configuration before continuing.
Configuration
Single Triode 300B
Single Triode 2A3
Parallel Triode 300B
Parallel Triode 2A3
Copyright © 2007, 2008 AudioNote Kits
www.AudioNoteKits.com
audionotekits@rogers.com
Description
300B Filament 5v
W5 & W7 inputs 0 & 8.3v (Green & Violet)
6SH7 Filament 6.3v
W6 & W8 inputs 0 & 8.3v (Blue & Black)
2A3 Filament 2.5v
W5 & W7 inputs 0 & 6.2v (Green & Black/Green)
6SH7 Filament 6.3v
W6 & W8 inputs 0 & 8.3v (Blue & White)
300B Filament 5v
W5 & W7 inputs 0 & 8.3v (Green & Violet)
300B Filament 5v
W6 & W8 inputs 0 & 8.3v (Blue & Black)
2A3 Filament 2.5v
W5 & W7 inputs 0 & 6.2v (Green & Black/Green)
2A3 Filament 2.5v
W6 & W8 inputs 0 & 6.2v (Black & White)
Value Designator
110R R2
330R R1
91R R4
360R R3
100R R2
100R R1
91R R4
360R R3
110R R2
330R R1
110R R4
330R R3
100R R2
100R R1
100R R4
100R R3
Page 31