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It's only been around two years since its first products hit the shelves, yet Blackstar is already seen as one of the UK's top amp builders. However, it isn't just down to having good products and snappy marketing – an amp can have all the right features and styling, but within 10 seconds of plugging in, it will either connect with what makes you want to play music or it won't. So, after the long wait, do the Series 1 amps have that indefinable 'I want' magic? Let's find out.

The Series 1 range launches with three products: a 45-watt 2 x 12 combo, a 100-watt head and the KT88-powered flagship 200-watt head. We certainly like the attention to detail that's evident in the appearance of all three amps; cabinets are built to a very respectable standard, with super clean woodwork matched by flawless vinyl covering and sharp control panel graphics. No question about it, this trio certainly looks the part.

S1-100 head

Inside the chassis it's much the same story, with typically neat and robust PCB construction. There are boards for the front and rear panels, with three larger ones handling the power supply and main preamp components, all supported properly on robust metal standoffs.

The valve bases are all PCB-mounted, which is fine – the only practical drawback is that preamp valve replacement is trickier, as they're quite deeply recessed into the chassis. These aren't simple amps, so those PCBs are stuffed full of components, with several bundles of interconnecting wires all neatly terminated in plugs and sockets. The chassis is a tough steel box and needs to be, as the amp has substantial transformers.

"The crunch mode has some of the best tone and response we've heard from any amp in any price bracket for a very long time."

The S1-100 has two pairs of gain and channel volume controls sharing a single EQ network. One channel is dedicated primarily to clean sounds and can be switched between two modes – warm and bright.

The other channel is for overdrive and again there are two modes, called crunch and super crunch. Next to the conventional bass, mid and treble controls is Blackstar's now-familiar Infinite Shape Factor (ISF).

Put simply, this knob changes a classic British EQ network into its American counterpart, with an infinite range of subtle colours between the two extremes. The master section has global controls for volume, presence and resonance, which govern the output stage's high and low frequency response.

Lastly, perhaps the most powerful control on the panel is Blackstar's Dynamic Power Reduction feature, or DPR. This is a circuit that varies the power stage's output from maximum down to just 10 percent, so you can go from 10 watts to 100.

Rear panel features consist of a series effects loop with switchable levels, a speaker-emulated recording output with balanced and unbalanced connectors, speaker outlets with switchable impedance, a socket for the supplied footswitch, and a pair of MIDI sockets for channel switching using MIDI program change commands.

Overall, a very good-looking and highly specified amp, but what really matters is how it sounds and responds.

Sounds

Check out a few audio clips. First, here's the clean channel in bright mode:

Now switched to warm mode:

Crunch mode:

Super crunch mode:

Finally here's a longer piece that shows off a range of the S1-100's sounds: