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The S1-104EL34 guitar amp head offers Clean and Crunch channels, plus two high-gain overdrive channels (with high and low output damping) plus a second Overdrive Channel EQ (complete with independent Infinite Shape Feature). The three-band EQ works with the Infinite Shape Feature (ISF) to provide infinite new tone-shaping control. The Master section provides Master Volume, Resonance, and Presence controls. Four EL34 power tubes deliver the best of British hi-gain tone. Dynamic Power Reduction (DPR) reduces the power up to 90% with no loss of tone, ideal for studios and smaller venue gigs. Professional touches include a series effects loop, emulated speaker output, and MIDI switching.

Blackstar Series One 104EL34 100W Tube Guitar Amp Head Features:

100 Watt head with built-in DPR power reduction
4 x ECC83, 1 x ECC82, 4 x EL34 valves
4 footswitchable channels
Clean channel with Warm (Plexi) and Bright (Class A) type modes
Crunch channel with Crunch and Super Crunch modes
Two overdrive channels with high and low output damping
Two ISF equipped tone control sections
Presence and Resonance controls
Master Volume
Series effects loop
MIDI switching
Speaker emulated output