Klemt Echolette Isophon ME II S Rotor Amplifier Speaker

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The ME series of rotor amplifiers and speakers from Echolette for electronic organs began in 1971 with the ME I, followed by the ME II in 1974. The ME II S variant was launched in 1978. 

The technical changes to the ME II S compared to earlier ME models were a new preamplifier board and a small amplifier in the bass/midrange section, and an additional rhythm unit, guitar or second organ manual can be connected via a second channel. The channels have separate controls for bass and treble. It has a fully transistorized PA mixing amplifier, two preamplifiers, tone control, driver stage and power amplifier, low-midrange section with a 30 cm full-range speaker, mid-high range with pressure chamber system, 2-stage rotating dual dispersion. 
Power: 230 V at 50/60 Hz. 
Output power: sine wave 80 watts, music 120 watts. 
Distortion factor less than 0.3 % at 1000 Hz. 
Frequency range: 40 Hz - 20 kHz at +/- 1 dB.
(Source: HiFi archive)