VALVES: ECC83 driver and 2 x EL84. Around 15W output.

VIBRATO CHANNEL: volume, bass, middle, treble; vibrato speed and depth. Treble boost.

NORMAL CHANNEL: volume, treble, middle, bass; and reverb depth. Mid boost.

EFFECTS: vibrato, reverb and distortion (preset) switched on or off via a footswitch.

SPEAKER CABINET: either a 2 x 12″ open-backed cabinet containing two Celestion alnico silver drivers (T1088 with doping to aid power handling), or sometimes a 2 x 10″ containing two Celestion 7442s (as in the case of the 710). Swivel trolley.

A nice demo here on youtube –