JBL SE-408 SE / Stereo Power Amp f. Paragon, Lancer etc. / 220V / überholt!
Stereo Endstufe von JBL. Es ist die gehäuselose Variante der SE-400 SE. Gedacht zum Einbau in JBL Gehäuse etc., mit den passenden Filterkarten für JBL Paragon, Lancer 99, Athena, L-101, C-56, C-50, C-50SM, C-51, C-60 etc., man benötigt dann 2 Stereoendstufen für Stereobetrieb. Inklusive 2 Filterkarten. 220/240V. Gebrauchsspuren. Die Endstufen wurde kpl. instandgesetzt. Die Bilder stammen noch von vor der Überholung. 6 Monate Garantie. (Auch noch eine zweite und eine JBL S-408 SE da!)
JBL SE-408S Transducer Energizer - takes the place of a conventional stereo power amplifier, mounts directly into the rear panel of JBL loudspeaker enclosures. Plug-in equalizer boards tailor the characteristics of the SE-408S to precisely match the requirements of the loudspeaker systems which it drives. Performance of such a self-Energized combination is audibly superior to that which can be realized from any all-purpose amplifier
Plug-in equalizer boards match the performance of each channel of the Energizer to the requirements of the particular loudspeaker system used; exact damping for best transient reproduction, final frequency response correction for smoothest response. With the boards inserted for unequalized operation, the Energized operates as a laboratory standard power amplifier of the highest quality.
The JBl T-Circuit is an analog computer-type operational DC amplifier, the most nearly perfect amplifying circuit ever developed. All stages are direct-coupled, including the output stage, so that accurate control of the loudspeaker is maintained all the way down to zero frequency.
80 watts continuous RMS power;
40 watts per channel, at any frequency from 10 cps to 30,000 cps
Frequency Response: with equalizer boards inserted for unequalized operation):
±0,25 dB form 20 cps to 20,000 cps
±1,5 dB from 3 cps to 175,000 cps
Harmonic Distortion: less than o,15% from 20 cps to 20,000 cps at 80 watts or any level less than 80 watts
Intermodulation Distortion: less than 0,15% at 80 watts or any level less than 80 watts (IHF standard 60 - 7,000 cps, 4 : 1 ratio)
Sensitivity: 0,8 to 3,0 volts input for rated output, depending upon the particular equalizer boards installed.
Hum and Noise: 90 dB below rated output
Transient Response: with equalizer boards set for unequalized operation, rise time is 2,0 microseconds from 10% to 90 % of square wave signal at 160 watts peak power or any lower power level. Response to such square wave signals is free from detectable overshoot or ringing, as observed on an oscilloscope.
Overload Recovery: less than 1/10th of one cycle to recover from 100% single cycle overload at any frequency from 20 to 20,000 cps
Output Impedance: 8 Ω rated impedance
(when driving a 16 Ω load, meets all published specifications except that power output is reduced to 64 watts. Wen driving a 4 Ω load produces 130 watts of undistorted power for brief periodes of time. Prolonged operation at more than 40 watts per channel however will trigger the built-in automatic overload devices.
Stability: the SE-408S, like the SA-600, utilize the exclusive JBL T-Circuit. The circuit is completely stable when connected to any loudspeaker system or even to a capactive load. Specifeid distortion and stability without ascilation are maintained through extreme variations in output load, whether resistiv, capacitive or inductive. Moreover, AC line surges do not affect the stability of the circuit.