Blackstar S1-104 ЕL34 100-Watt Guitar Amp Head
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Blackstar Series One 104EL34: a flagship tube amplifier for maximum power and tonal control
Series One is a reference amplifier series from one of the most respected names in guitar amplification. These units are designed to impress players across all genres with exceptional flexibility, detail, and sonic performance.
The philosophy behind the series is to provide a unique instrument capable of delivering any tonal character at the highest level, without emulations and with the full transparency of a true boutique-style tube amplifier.
Series One represents a combination of British engineering quality, dynamic response, versatility, and straightforward usability.
The lineup ranges from a 200-watt KT88-powered head to a 45-watt combo capable of handling any stage. The series also includes the innovative patented technologies DPR and ISF.
DPR (Dynamic Power Reduction) allows the amplifier’s power to be reduced down to 10% without sacrificing tone. Unlike similar systems from other manufacturers, it is a dynamic, continuously adjustable control rather than a simple switch, preserving the natural tube character.
ISF (Infinite Shape Feature) is one of Blackstar’s most important and creative technologies, enabling real-time tonal shaping from classic American voicings to traditional British sounds.
Blackstar Series One 104EL34 — flagship power and flexibility
Blackstar Series One 104EL34 is a serious amplifier for serious musicians. It is built around four EL34 power tubes, delivering a dense, powerful, and highly responsive tone.
Advanced DPR and ISF systems turn this amplifier into a full creative platform for tonal experimentation.
The 104EL34 features four channels and an additional preamp tube, providing extensive tone-shaping capabilities.
This architecture makes it a highly versatile tool suitable for both rehearsals and large-scale live performances.
Blackstar ISF — expanded tonal range
The patented ISF system works alongside a standard 3-band EQ (Bass, Middle, Treble), significantly expanding tonal possibilities.
It allows seamless transitions between classic British crunch and tight American high-gain tones, enabling players to create their own signature sound.
ISF affects the entire frequency spectrum while preserving the natural response of a tube amplifier.
Technical specifications Blackstar Series One 104EL34
• 100-watt tube head with DPR system
• Tubes: 4x ECC83, 1x ECC82, 4x EL34
• 4 channels with footswitch control
• Clean channel: Warm (Plexi) and Bright (Class A) modes
• Crunch channel: Crunch and Super Crunch modes
• Two overdrive channels
• ISF (patented Blackstar technology)
• Presence and Resonance controls
• Master Volume control
• Effects loop
• MIDI switching
• Emulated output
Review of Blackstar S1-104 ЕL34 100-Watt Guitar Amp Head
📍 All amplifiers marked “In Ukraine” are located in our shop in Dnipro, Ukraine.
We are verified sellers and official dealers for many brands, with 15+ years of international experience.
We’ve shipped thousands of guitars and amps worldwide — to Europe, the UK, Japan, Australia, New Zealand, and the USA — even during wartime, without any issues.
🚚 Worldwide shipping: via Ukrposhta or EMS, safe and fully insured (usually $150–200).
📦 Shipping across Ukraine: via Nova Poshta or local pickup with a chance to test the instrument through tube amps (Mesa Boogie, Marshall, Fender, Soldano, Friedman, Vox, and more).
