From Blackstar:

The elegant Studio 10 EL34 is a low gain, classic British crunch amp with an EL34 in the power amplifier and an ECC83 in the preamp stage, resulting in a flawlessly boutique, sultry crunch. This model includes a footswitchable preamp Boost for an authentic classic rock and indie rhythm tone and articulately powerful blues leads.

Front Panel Features:

• Input Sockets
• Volume
• Boost
• Tone
• Reverb
• Master
• Standby
• Power

Rear Panel Features:

• Emulated Output (Mono, taken after the power amp)
• Series effects loop
• Effects level switch
• Footswitch (Supplied 1-button to activate boost feature, or use an optional 2-button for boost or overdrive and reverb)
• Mains in
• 3 speaker outputs – 1 x 16 Ohm, 1 x 8 Ohm and 2 x 16 Ohm