Series One MK II
Series One MK II

The New #1
Series One MK II is the ultimate professional high gain valve guitar amp. In the studio or on the road, our Series One MK II valve amps will always deliver. Whether it’s build quality or tonal excellence, no compromises have been made – if you are looking for the ultimate, professional high gain valve amplifier, why compromise? We didn’t.

Dual Patent
At the heart of the Series One MK II’s design is a quartet of 6L6 power valves which are complimented by two patented circuits: the ISF (Infinite Shape Feature) tone control and the DPR (Dynamic Power Reduction) system.
Exclusive to Blackstar Amplification, these innovations stem from extensive technical research. With ISF and DPR, you can customise the Series One MK II’s sound palette to match your unique signature sound and create ‘the sound in your head.’

Better by Design
The Series One MK II is built for unbeatable tone and reliability, with over 30 circuit and voicing mods developed over years of refinement from the original amp.
Designed for the rigors of touring, Series One MK II amps feature double-sided PCBs, seam-welded 1.6mm steel chassis, and birch ply cabinets. Heavy-duty mains and output transformers, made from top-grade, grain-oriented steel, ensure robust performance on the road.
SKU




The Series One MK II is a refined and streamlined range designed as the ultimate modern flagship amplifier and cabinet, tailored specifically for the needs of today’s metal guitarists. This evolution of the range marks a significant leap forward in high gain, high performance amplification, with the 4 channel Series One 100 MK II taking centre stage—a high-gain powerhouse engineered for crushingly tight rhythm tones and thick saturated leads, devoid of the unwanted fizz often present in other designs.
- 100 Watt valve head
- Dual Patent Design
- Patented Infinite Shape Feature (ISF)
- Patented Dynamic Power Reduction (DPR)
- 4x ECC83, 1x ECC82 & 4x 6L6 valves
- Four footswitchable channels
- Best in class high gain Overdrive channels
- Clean channel with Warm (Plexi) and Bright (Class A) type modes
- Crunch channel with Crunch and Super Crunch modes
- Master Resonance, Presence and Volume
- MIDI switching
- Series effects loop with effects level switch
- Speaker emulated output
- 1.6mm seam welded steel chassis
- Birch ply cabinet
These standard ‘1960’ size 4×12 cabinets are built using a special baffle construction for a more balanced mid range response. Fitted with Celestion Vintage 30 speakers, you get a 4×12 with tone and projection unlike any other in its class.
- 240W extension cabinet
- Mono 8Ω / Stereo 2×16Ω
- Celestion Vintage 30’s
- Special baffle construction
- 18mm finger-jointed birch plywood construction

DPR (Dynamic Power Reduction)
DPR allows continuously variable power reduction so you can use your valve amp in any playing situation and achieve pure valve output distortion and compression at any volume. DPR is a 'dynamic' circuit, delivering the exact compression (a.k.a. sag) of a small overdriven valve amp, at any volume level. The power is reduced, the feel, tone and reliability of the amplifier is maintained.

ISF (Infinite Shape Feature)
The ISF control allows you to infinitely adjust the response of the tone control network between any of the traditional voicings in a way that has never before been possible. The whole tone stack response (i.e. Bass, Middle and Treble) is moved yet the tone controls remain fully interactive, just like in a regular tone stack.
The ISF control is continuously variable between all the traditional responses allowing you to effectively design your own sound.

6L6 Valve Power
Inside the Series One MK II you'll find a quartet of premium 6L6 power valves and five preamp valves (ECC82 and ECC83).
6L6 valves have long been the top choice for heavier music styles, delivering a rich, tight low end and sharp yet smooth highs that cut through any mix.

Built to Last
Constructed from premium grade materials and using traditional methods, Series One MK II amplifiers are designed to last a lifetime.
Every aspect of a Series One guitar amplifier is designed to deliver not only the ultimate tonal performance, but also reliability capable of withstanding the rigours of life on the road.
Celestion Vintage 30's
The Series One PRO 412B MK II cabinets feature industry standard Celestion Vintage 30 speakers ensuring the amp delivers a perfectly balanced mid-range response with superior articulation and power.
Transformers
The Series One MK II features high-grade, grain-oriented steel transformers for both output and mains. The output transformer ensures a responsive feel, natural frequency response, and enhanced low-end clarity, while the mains transformer reduces stray magnetic fields, minimizing noise and hum for a cleaner sound.
De-Rated Components
As part of our design process, all amplifiers undergo rigorous endurance testing on custom automated equipment, simulating years of real-world use in just a few days.
Chassis & Cabinet
The chassis of the Series One MK II is made out of seam welded 1.6mm steel for tank-like strength.
The wooden cabinets of Series One MK II heads and speaker enclosures are constructed from birch ply. They are rigorously tested to ensure they really will hold up against anything you throw at them.
PCB
Series One MK II amplifiers feature plated-through double-sided PCBs for enhanced durability. Heavier copper is used on the output valve PCBs, with handwired, neoprene-sleeved anodes to reduce discharge risk from high supply voltages. High-quality locking connectors ensure reliable connections.
BLACKSTAR SERIES ONE MKII DIALING IN THE CHUG ON THE NEW 2024 AMP BY BLACKSTAR OD1 & OD2 ONLY !

















