Amplificador De Bajo SWR Sm400s USA

Amplificador de bajo SWR SM400s estereo con preamplificador valvular 12ax7 con manuales y cable banana jack (para el modo bridge / mono).

Hecho a mano es Sylmar, California; USA por Steve W. Rabe en el 97 (el tecnico de sonido de Jaco Pastorius). En el 99 la marca fue vendida y despues la conpro Fender y ahora es otra cosa.

Unico por su estado.

Controles (frente):
Nivel de ganancia con led de clip; Limitador/compresor con led de atenuacion; Aural enhancer: ecualizador de 4 bandas semiparametrico (frecuencia y nivel); Graves y Agudos; control de tranparencia; Master; control de frecuencia del crossover; control de balance de las dos potencias en el modo estereo.

Salidas y controles de la parte posterior;
4 salidas para para parlantes en el modo estereo; una salida para el modo bridge mono; switch mono/estereo; salida a efectos; entrada de efectos (una mono y una estereo); salida para hacer biamp (crossover low y high); salida balanceada XLR con pad de nivel, ground lift y switch direct/line (sonido como caja directa o el sonido afectado por el preamplificador).

300 watts en 2 ohms por canal; 250 watts en 4 ohms por canal ; 150 watts en 8 ohms por canal (modo Estereo)
550 watts en 4 ohms; 400 watts en 8 ohms; 250 en 16 ohms (modo mono bridged)
Permite modo biamp con el crossover (bajos por una potencia, agudos por la otra)
Podes usar una sola potencia sin prejuicio a q le pase algo a la otra.
Viene de fabrica para conectarlo a 220 (tambien permite 100 120 240)
A diferencia del sm 400 este tiene mas potencia, un cooler con velocidad variable, control de transparencia y nivel de salida en la conexion balanceada XLR

Tengo mas fotos, fijate en mis otros producos publicados o googlealo.

Tambien tengo un párlante HARTKE de 15" XL de 250 watts en 4 ohms que lo pueden comprar en conjunto con este equipo.


The SM-400 underwent its first upgrade in 1993 and was renamed the SM-400S. The amplifier's power output was increased to 500 watts (@ 4 Ohms in Bridge/Mono Mode) and some new features were added (Internal Cooling Fan) including features that were previously available only as factory modifications (XLR Pad & Ground Lift, and Transparency Control.

GENERAL INFORMATION AND DESCRIPTION
The SM-400S Bass Amplifier provides the power, performance, flexibility and portability needed by the professional bass musician for every style of playing and nearly every situation he/she will encounter.

To accomplish the above statement, we had to use almost every imaginable type of electronic component available. This added up to an all TUBE preamp section, a limiter using Field Effect Transistors, tone and equalizer controls utilizing Integrated Circuits and two individual power amps employing discreet, solid state devices.

The power amplifiers in the SM-400S can be used individually to provide full biamp capabilities when used with the built-in adjustable electronic crossover or can function as stereo, 250 watt power units. If you need more power, the amps can be bridged for 400 Watts @ 8 ohms or 550 watts @ 4 ohms. The power amps are cooled by a thermostatically controlled fan.

Front panel features include Hi and Low Gain input jacks, Gain and Master Volume controls, Integral Limiter and an exclusive feature we call an Aural Enhancer. Tonal flexibility is achieved with Bass, Treble and Transparency controls and a 4 band Variable Graphic Equalizer. The Crossover Frequency Control adjusts the crossover points of the electronic crossover and the Balance control adjusts the levels of the two power amps when used in the stereo mode.

The back panel features and XLR Balanced Out switchable for direct and line out, XLR Pad w/gnd lift, Crossover High and Low Frequency Output jacks, and Mono and Stereo Effects loops. A power amp assign switch selects stereo or bridge mode and for speaker outputs, there are two jacks each for left and right out or one banana jack for mono operation.

The SM-400S is rack mountable, taking up two rack spaces (3 1/2") by 11 3/4" deep. It is housed in an all aluminum chassis for light weight and lasting beauty and weighs just over 18 pounds. It is easily carried by the handles secured to the front panel.

The tube employed in the preamplifier is a specially selected Groove Tube 12AX7A and should not need replacing for one to three years depending on usage and care of your unit.

We truly hope you enjoy your amplifier and find it all you have ever wanted in a bass amplifier and more. If you ever have any questions or suggestions, please don't hesitate to call or write us at the factory.

SPEAKER OUTPUT JACKS
NOTE: If you are using only one channel (in stereo mode), use the left channel speaker output. The thermal sensor for the fan is located on the left heat sink.

When used in the stereo mode, the internal power amplifiers of the SM-400S will deliver 300 watts @ 2 ohms, 250 Watts @ 4 ohms and 150 Watts into 8 ohms. Optimum performance will be achieved by using a total of 4 ohms per channel. When using 2 ohm loads, the amplifier will run hotter than normal and the internal fan will be running most of the time. Minimum load in the stereo mode is 2 OHMS!

When used in the Bridge mode, the SM-400 will deliver 250 Watts into 16 ohms, 400 Watts into 8 ohms and 500 Watts into 4 ohm loads. Make sure the speakers you use in this mode can handle the power. Minimum load in the bridge mode is 4 OHMS!
COOLING FAN
All SM-400S's with serial numbers greater than #6125 and manufactured after September, 1993, have an internal thermostatically controlled cooling fan. When the temperature of the heatsinks reach 50 degrees centigrade, the fan will automatically turn on and remain on until the heatsink cools down to approximately 40 degrees centigrade. This allows for "silent running" when used at low power levels.