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The Marshall JMD:1 series amplifiers are hybrid models that feature a digital preamp section with 16 different Marshall amp voicings, a power amp section driven by EL34 tubes, and built-in studio-quality effects. 
Key specifications for the JMD:1 series generally include:
Core Specifications
Amplifier Type: Hybrid (Digital Preamp, Tube Power Amp).
Power Output: Available as 100-watt (JMD100 head, JMD102 combo) and 50-watt (JMD50 head, JMD501 combo) versions.
Power Tubes: 4 x EL34 tubes in 100W versions; 2 x EL34 tubes in 50W versions.
Preamp Tubes: One ECC83 (12AX7) tube for the phase inverter.
Channels: 4 channels (Clean, Crunch, Overdrive, Lead) with 16 different preamp models/voicings available across them.
Presets: Up to 28 programmable patch presets via the included footswitch (7 banks of 4) or up to 128 via MIDI. 
Controls and Effects
EQ: Traditional Volume, Gain, Treble, Middle, and Bass controls for the preamp section; global Master Volume and non-programmable Presence controls.
Built-in Effects:
Reverb: Independent digital reverb.
Delay: 4 types (Hi-Fi, Analog, Tape, Multi-delay) with level control.
Modulation: 4 types (Chorus, Phaser, Flanger, Tremolo) with depth control.
Noise Gate: Built-in noise gate.
Footswitch: A 6-button Stompware foot controller is included. 
Connectivity and Hardware
Inputs: 1/4" instrument input, 1/4" line-in for MP3/CD players.
Outputs: Speaker-emulated balanced XLR line-out for recording, headphone socket, preamp out jack.
Effects Loop: Series/parallel effects loop with switchable levels (-10dBV/+4dBu) and storable mix setting.
MIDI: MIDI In and Thru connections for external control.