Klemt Echolette S40 Showstar Tube Amplifier

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The S40 Showstar amplifier was presented at the Frankfurt Music Fair in 1962. It was the first music amplifier with 40 watts and was specially designed for guitars. A vibrator can be switched on. The two inputs have a separate 2-band tone control and a presence control is also available. Later variants of the S40 are the S40L, S40N G40 and G40H.

Operating voltages: 110, 120, 220, 230 V at 50-60 Hz; power consumption: 140 VA; tubes: 2 x ECC 808, 1 x ECC 81, 2 x EL 34; rectifier: 1 x B 500 C 400, 1 x E 50 C 50; optocoupler: photo resistor type ORP 62; 2 preamplifiers, tone control and driver stage, phase inversion stage, push-pull B-end loop, vibrato generator; power: sine 32 watts, music 40 watts; distortion less than 2% at 1000 Hz; frequency range 40 Hz - 15 kHz +- 1 dB; inputs: 2 x normal, 2 x vibrato, all with sensitivity of approx. 15 mV; sound correction per input: treble +-12 dB at 10 kHz, bass +-15 dB at 50 Hz, presence +8 dB at 8 kHz.
(Source: Hans Ohms, Hi-Fi Archive)