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SLT 200 Professional Power Amplifier

The Cabinet

The Cabinet is made of 2 mm steel plate, protected against rusting. The cabinet parts are mounted with hex cone steel screws.

The amplifier boards.

All electronic parts are on 2 circuit-boards, one for each channel. Each board has its own protection circuit, so in case of faults, only one channel will stop working. The board can easily be exchanged in case of a defective part.

The MOSFET.

In the SLT 200 we have included a gem of a MOSFET transistor. It handles 520 Watts, and a peak current of 300 Ampere, all on a single die. This is the first time a 200 Watt power amplifier has been made without using several power transistors in parrallel. Transistors are not identical, so they have to be matched, in order to work well together.

But matching takes time and cost money, so it is often not done. Even with good matching, there is a difference, and they will sound like a choir, not like a single voice.

The Single MOSFET power amplifier has a both smooth and detailed sound quality, which until now only was available in some low powered amplifiers.

The input.

The input is an active balanced low noise JFET stage, using a Neutric XLR socket. The gain is normally set to 0 dBu(0,7746 V) for full power, However, two gold plated switches inside allow precise reduction of gain by 6, 12, or 14 dB. So you can match the SLT 200 to almost any source with minimum noise from the combination.

The Protection.

The unique protection circuit idea has been used in all our power amplifiers. Due to the high current MOSFET we can allow high peak currents , and we only need to mute the input signal in case of long term overload. The protection detects DC errors, high level subsonic signals, long-term ultrasonic signals, high temperature, and to low impedance loads or short circuits. If needed, the protection will simply mute the input signal, and if necessary open the output relay. The relay will normally open only after muting the input signal to avoid relay switching of strong currents that could corrode the relay contacts. So in case of i.e. a short circuit the input is muted for a second. Then a 1 millisecond long pulse is sent out to test again. If the short circuit still is present, it waits a second and tries again, and so on. As soon as the user has removed the faulty cable, the system will quickly remove the muting. The protection also detects too low impedance loads, and alerts the user by muting for a second. So the user can be sure to hear only clean non-distorted audio. The normal current limiting and momentary distortions of the music are avoided in the SLT 200.

The Fuse.

Due to the advanced protection, the only fuse needed is the mains fuse, which is placed on the front panel

The Output.

Both normal binding posts, and Speakon connectors are provided. The connectors are recessed, so that they will not be damaged.

The Lifetime.

Our amplifiers from 1985 still work in professional recording studios, often doing their job 16 hours a day. So we expect our SLT 200 to be very reliable. In fact, the chance of a breakdown is reduced a lot, since there are only 4 output transistors, instead of maybe 24 or 30, each of which could cause a breakdown.

The Sound.

We use the term Natural Dynamics to describe the ability of the SLT 200 power amplifier to keep different levels of sound apart also in a complex musical passage. The performers are almost physically present. You will be pleasantly surprised to hear how much better your music will sound.

Specifications:

• Shipping weight is 15 kg.
• Dimensions are 3 unit 19″ and 380 mm deep behind front panel.
• Idle power consumption is 90 Watts.
• Output power in 8 Ohms load is 200 Watts or 23dBW.
• Output power in 4 Ohms load is 400 Watts or 26dBW
• THD is typical 0.008% at 1 kHz 200 Watt in 8 Ohm.
• CCIF 15kHz is 0,004% Temperature protection at 70 degrees Celsius.
• Speaker loads below 1.5 Ohms are not allowed by the protection circuit
• Noise is at least 100 dB below 200 Watts in 8 Ohms. This depends on the gain selected. Noise will be higher, if the SLT 200 is subject to very strong external electromagnetic fields.
• Input impedance is 10 kOhm active balanced.
• The 3 pin XLR socket has pin 2 a plus, pin 3 as minus, and pin 1 as ground.
• Sensitivity can be selected internally to be 0.77V, 1.55V, 3.1V or 3.9V for full power.
• The output for a loudspeaker is single or bi-wiring, using 4 mm banana plugs or stripped wire.
• SLT 200 E11/1