The Blackstar HT-Dual is a modern classic in the world of tube-driven distortion. Unlike "starved plate" designs that run tubes at low voltages for show, the HT-Dual uses a high-voltage internal power supply to get genuine valve compression and harmonic richness.
Both halves of the tube are utilized. One half typically handles the initial gain stage, while the second provides additional clipping and drive. Blackstar Ht Dual Pedal Schematic
The pedal uses op-amps (often TL072 or similar) to boost the input signal before it hits the tube. This "pushes" the tube into saturation more effectively. The Blackstar HT-Dual is a modern classic in
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? One half typically handles the initial gain stage,
A dedicated filtering circuit at the end of the chain that rolls off high frequencies to mimic a 4x12 cabinet.
A complex arrangement of FET switches and logic gates that toggle between the "Clean/Crunch" channel and the high-gain "Lead" channel.