Engl E633BO Fireball 25 Blackout

The Fireball 25 in Blackout Finish: ENGL’s High-Gain Icon Takes on a Darker Look

The Fireball is one of the historic cornerstones of the ENGL catalog for guitarists looking for high gain, tight low end and an ultra-precise response. With the Fireball 25 Blackout E633BO, the German brand brings this aggressive character to a compact 25 W head, dressed in a particularly successful all-black finish.

This Blackout version retains the direct approach that has made the Fireball series so renowned: no unnecessary detours, effective controls and an instantly recognizable sound. Its portable format makes it a particularly compelling alternative to large high-power heads, without sacrificing the projection or sonic authority expected from an ENGL amplifier.

A Compact Head for Modern Metal, Rehearsals and the Studio

The ENGL Fireball 25 Blackout is primarily aimed at rock and metal guitarists looking for tight, articulate and versatile overdrive that can be used in a wide range of settings. It is equally well suited to experienced musicians wanting a reliable amplifier for rehearsals and gigging guitarists looking for a compact head to pair with a 1x12, 2x12 or 4x12 cabinet.

Thanks to its Power Soak attenuator, it remains highly practical in a home studio and at home. The 1 W setting preserves a lively response while keeping the volume under control, while the 25 W output provides enough headroom for demanding rehearsals and small stages. Its character is particularly well suited to hard rock, heavy metal, thrash, metalcore and modern styles that demand excellent definition in low tunings.

Two Effective Channels, Power Soak and Noise Gate for Getting Straight to the Sound

The Fireball 25 Blackout features two simple, complementary channels. The Clean channel has its own gain control and delivers bright clean tones with enough body for arpeggios, open chords and ambient parts. Turning up the gain can also produce a lightly expressive crunch.

The Lead channel takes over for heavy rhythm parts and saturated solos. Its independent gain control lets you precisely set the amount of saturation, from aggressive rock to modern high-gain metal. The Lead Volume control makes it easy to balance the two channels before adjusting the overall level with the Master Volume.

The three-band Bass, Middle and Treble EQ shapes the frequency spectrum with precision, while the Presence control affects high-end definition and overall openness. The Mid Boost switch enhances the midrange to help the sound stand out in a dense mix, particularly during solos. An adjustable Noise Gate on the rear panel is dedicated to the Lead channel, keeping stops tight and palm mutes perfectly clean.

The effects loop makes it easy to integrate delays, reverbs, chorus or external processors after the preamp’s overdrive. The Power Soak offers several power levels, from full power down to 5 W and then 1 W, as well as a Speaker Off position suitable for use without a cabinet when paired with an appropriate external solution.

The Fireball Tone: Tight Low End, Cutting Mids and Articulate Saturation

Built entirely around tubes, the Fireball 25 Blackout combines four ECC83s in its preamp with two 6L6s in its power amp section. This configuration delivers fast, controlled lows, pronounced mids and a precise attack, even at high gain. Riffs remain clear, complex chords retain their separation and single notes keep their bite.

The Lead channel delivers dense, modern saturation with just the right amount of compression to facilitate fast playing. It excels at palm-muted rhythms, low tunings and sustained leads. The Mid Boost adds more presence in the upper midrange, making it easier to cut through the mix without having to increase the volume excessively.

Less expected from its clean sounds, the Clean channel nevertheless offers impressive clarity and an enjoyable dynamic response depending on pick attack. The Fireball 25 is notably associated with guitarist Trey Xavier, whose musical world perfectly illustrates this head’s preferred territory: modern tones, cutting rhythms and defined high gain.

Technical specifications

Category	Guitar amp head	Attenuator	Yes
Technology	Tubes	Number of channels	2
Effects loop	Yes	EQ	3-band + presence
Amp tubes	2 x 6L6	Color	Black
Pre-amp tubes	4 x 12AX7	Power output	25 W

Type	all-tube guitar amplifier head	Loudspeaker outputs	8 ohms and 16 ohms
Power	25 W	Finishing	Blackout
Power amp stage	2 x 6L6	Width	420 mm
Preamp	4 x ECC83 / 12AX7	Height	200 mm
Power Soak	full power, 5 W, 1 W and Speaker Off	Depth	230 mm
Channels	Clean and Lead	Weight	11 kg
Three-band EQ	Bass, Middle, Treble