PAK II DUAL CHANNEL:   Dual Concentric Gain and Master Controls   (3) 12AX7 and (2) 6AQ5 tubes   Bright, Channel, Presence and Boost Switches   Channel and Boost foot switchable   Treble, Middle, Bass tone stack   Buffered FX Loop Send and Return   cathode follower driven tone stack   Buffered FX Loop Send and Return   Speaker response simulated balanced line out   Silent operation with internal 8 ohm load resistor   Speaker Impedance selector - 8 and 16 ohm   Built in cooling fan with on/off switch   Made in USA custom Heyboer transformers   Compact size: 9" x 7" x 2 1/2"    6.5 lbs total weight   Export voltage switch 100V 220V   18 watts @5% THD   fixed biased    long tail pair phase inverter