The instrument
The CRB X 100 is a rotary speaker with two speeds, slow and fast. He is on the marked in the late 1960'.
Details
The CRB Super X 100 is controlled by a pedal with two switches: start of the effect and speed. It has two input Channels, Channel 1 sensitivity 15 mv and Channel 2 120 mv, a volume control for each channel, a double tone control bass and treble, a reverb (spring) on both channels with volume control a readiness for an additional footswitch to remote control the reverb. The Output Power is 50W.
The rotating speaker is located in the upper part of the cab. The lower part is occupied by a large fixed speaker that only handles the 'straight' sound. When the rotating effect is activated, all the sound passes through the upper speaker who rotates vertically. The sound comes out through three vents on the sides and top of the cab. The real Leslie sends the sound 'horizontally'.
(source: audiofanzine)