M10S is a single ended Class A tube integrated amplifier, it can use 6550 and swapped to EL34 and KT77 only by re-biasing actually. As a mini size integrated tube amplifier, there is one feature which distinguish the Cyber 10 with similar pentode SE amp which use a self-bias circuit, M10S incorporate a fixed bias design for easy tube swap and more power delivering as well. Single bias adjustment mechanism for each output tube has been equipped inside chassis, a trim pot for adjustment to get to 0.4mA bias current. The bias adjustment can be measured by a voltmeter (not come with the amp). While the output tube is operating with in Ultra linear mode to give 12W output power, there is also a switch to operate the amp in triode mode which halves the output power to 6W.
On the other hand, you could use M10S as a heavy design tube headphone amplifier with output transformer which can easily adapt to headphone having impedance ranging from 10 to 600 ohm. One 3.5mm jack and 3 RCA inputs have been equipped behind of chassis. Selectable and volume control is remote-able as well.
CONTROL FUNCTIONS: Volume, Mode Switch, Power On/Off and Triode / Ultralinear Switch
POWER OUTPUT: 12.5 watt ( Ultralinear ) / 8 watt ( Triode ) RMS 1kHz
TOTAL HARMONIC DISTORTION: less than 1%( 5 watt, 1kHz )
FREQUENCY RESPONSE: ( -3dB points at 5 watt ) 6Hz-60kHz
INPUT SENSITIVITY: 280mV
INPUT IMPEDANCE: 100k ohms
SPEAKER OUTPUT IMPEDANCE: 6~8 ohms
HEADPHONE OUTPUT IMPEDANCE: 10~600 ohms
CONSUMPTION: 86 watt
INPUT INTERFACES: 3 group (RCA),1 group 3.5mm jack for Ipod
OUTPUT INTERFACES: speaker terminals and headphone jack - (on the front panel)
OVERALL NEGATIVE FEEDBACK: Little ( -6dB )
VACUUM TUBE: KT88x2,ECC82 x1,ECC83 x1
DIMENSIONS: 320 ( L ) x 260 ( W ) x 150( H ) mm WEIGHT: 15kg (packed)