The 12AX7 requires a specific filament voltage (usually 6.3V or 12.6V). If your pedal isn't lighting up or passing signal, this is the first place to check for a blown component. ⚠️ A Critical Warning The HT-Dual is not a beginner project for DIY repair. Lethal Voltages: The internal 300V rail can be fatal.
A dedicated filtering circuit at the end of the chain that rolls off high frequencies to mimic a 4x12 cabinet. Blackstar Ht Dual Pedal Schematic
Troubleshooting the switching power supply requires an oscilloscope and advanced knowledge of high-frequency electronics. If you'd like to dive deeper, let me know: Are you trying to repair a broken unit? The 12AX7 requires a specific filament voltage (usually 6
Both halves of the tube are utilized. One half typically handles the initial gain stage, while the second provides additional clipping and drive. Lethal Voltages: The internal 300V rail can be fatal