The ENGL Fireball 25 Blackout KT77 25W tube guitar amp head distills the Fireball platform into a compact all-tube design centered on a pair of KT77 power tubes and flexible output scaling. Four ECC83 preamp tubes feed Clean and Lead channels with independent Gain controls, shared Bass, Middle and Treble EQ, Lead Volume, Presence and Master controls. Mid Boost expands the voicing options, while an adjustable noise gate, tube-buffered serial effects loop and rear-panel power soak with Full, Mid, Low Power and Speaker Off settings give the amp practical control across different rigs and volume requirements. For players moving between home recording, rehearsal and stage use, the Fireball 25 Blackout delivers Fireball high gain in a compact 25W format with adaptable power and routing.

Clean and Lead Channels With Focused Gain Control

Clean and Lead channels give the Fireball 25 Blackout KT77 separate gain settings while sharing the main three-band EQ. Lead Volume, Presence and Master controls provide additional level and high-frequency adjustment, while Mid Boost adds another voicing option when more midrange emphasis is needed. The straightforward control layout keeps the two-channel format direct while leaving enough range to move between cleaner sounds and higher-gain settings.

KT77 Power With Flexible Output Scaling

Two KT77 power tubes produce the amp's 25W output, while the rear-panel power soak provides Full, Mid and Low Power settings plus Speaker Off. The selectable output modes let the same head adapt to different volume requirements without changing the core channel and EQ layout. A line output adds another routing option for compatible recording, monitoring and downstream equipment.

Noise Gate and Buffered Loop Support Complete Rigs

An onboard noise gate with rear-panel threshold adjustment helps manage unwanted noise at higher gain settings, while the tube-buffered serial effects loop provides a dedicated path for delays, reverbs and other processors. A dual footswitch jack supports the ENGL Z4, and speaker outputs accommodate one 8–16-ohm cabinet or two 16-ohm cabinets. Made in Germany and finished in the all-black Blackout aesthetic, the ENGL Fireball 25 Blackout KT77 25W tube guitar amp head combines compact dimensions with the switching, routing and output flexibility required for modern high-gain rigs.