Hifigem is the factory authorized  dealer for GATO. 

A typical MOS-FET push-pull power output stage consists of both positive and negative polarized transistors. Because it is impossible to make two identically behaving transistors with opposite polarization, small differences in the electrical characteristics must be accepted. This compromise of imperfection will create an asymmetrical amplification with a different signature in the positive and in the negative signal response. This often results in audible distortion and listening fatigue.

The multiple transistor circuits may offer great power handling but returns an asymmetrical and smearing of the time domain.  In this "choir" of transistors all of them are "singing" with a slightly different voice than its brothers and sisters. Smearing the micro transients and disrupting the time domain.

The simplicity of the TwinFET technology offers perfect time domain symmetry and clean and clear overwhelming sonic performance instantly noticed. 

The Gato Audio TwinFET amplifier is named from the design using two perfectly identical FET transistors that ensure perfect sonic timing, almost unlimited power and a perfect symmetrical high voltage swing. The TwinFET technology is sonically far superior to designs typically only focused on delivering voltage and current – not a perfect symmetrical time domain.

Vacuum tube amplifiers use identical tubes in the output. Some tube amps are designed with a single tube for positive swing and a single tube for negative swing. These amps have some similarities to the Twin FET except for limited power.

To supply more power output tubes are paralleled. This again creates a problem because of the difference between the tubes in the choir. Tubes have a finite life and start to deteriorate from the beginning. Problem is the deterioration curve is not the same on each output tube.    

 The Gato AMP-150 = 150WPC

In my opinion the AMP-150 is the best integrated made at any price.. Anyone who listens or owns one agrees. The Integrated AMP-150's  separate preamplifier is built from super low-noise, high­bandwidth parts. Special signal relays are located close to the input connectors for a short signal path rendering remarkably low levels of noise and distortion.

The separate amplifier section features a JFET input stage, a separate power supply for the critical driver circuit and a single set (two per channel TWIN FET) of unique high­-power MOSFET output devices (capable of 150 amps). The sound of the ultimate tube amps without the fuss.

Heat, current and DC offset are under constant surveillance by a microprocessor, protection circuit

The Gato PWR-222 Mono Power Amplifier

If you need more power (250 watts per channel output FET’s capable of 500 Amps) is the absolute in sonic performance, look no further.  It does not get any better than this no matter what the price or claim is! hifigem.com