Electronics 101½ Part 5 - Wiring the Filament Circuit - YouTube
5.2 Power supply for the vacuum tube filaments - Vacuum Tube Amplifiers - DIY
Crawls Backward (When Alarmed): Twisted Pair Filament Wiring for the Vibro Champ
On Vacuum Tube Heaters — Tropical Fish
GI46b linear, persistent AC hum on modulation. | WorldwideDX Radio Forum
Elevated filament supply | diyAudio
Heater Wiring - the Good the Bad and the Ugly | diyAudio
12.6 vac filament wiring 12AX7s
filament wiring
When to use artificial center tap | diyAudio
F-3116x TRIAD Power Transformer Sec 24 VAC Center Tap .2 Amps Pri 115 or 230V | eBay
Touch Plate Low Voltage 3000-PL Relay 4-Wire
The Valve Wizard
Create a Virtual Centre Tap for Guitar Amps
Filament transformer 6.3-6.7 volts with center tap 300 amps – eaglemade
The Valve Wizard
Newbie power supply section help needed | diyAudio
Crawls Backward (When Alarmed): Twisted Pair Filament Wiring for the Vibro Champ
Vacuum Tube Virtual Ground or Center Tap & Elevated Heater Wiring Explained - YouTube
The AA8V 6AG7 Amplifier - Construction Photos
Your preference on center taps?
Emission Labs. Application note about tube amplifier design.
Help with PT wiring | Telecaster Guitar Forum
Filament transformer 6.3-6.7 volts with center tap 300 amps – eaglemade
