AM Hi-End RT-1

The volume control system consists of a volume switch coupled to a volume transformer, that we produce and used for many years.
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The benefit of this volume control is that the sonic background is very quiet and natural with a detail rich retrieval and a rich musicality that will clearly reveal every note of any piece of music.
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We use a Single Ended design which is more natural sounding and dynamic than Balanced designs employed mainly for the studio environment.
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The R-T1 preamp is a dual mono design, from the transformers, power supply to the voltage regulation, all completely separated to avoid noise and cross talk. We use a large number of high value U-Cap copper foil capacitors, which were carefully chosen for their naturally detailed sound. The output transformers bandwidth will extend from15 HZ to 120KHZ
.The unique design of our new tube preamplifier named "Magnetic AM R-T1" can be implied from the prefix: "magnetic", which indicates its direct origin from the AM magnetic passive preamp. Not only does AM R-T1 utilise transformers for volume attenuation, it also employs another two transformers for the signal output and two more for power supplies.
The remarkable level of performance has been achieved with an all new audio and power supply circuit design. This new audio circuit is all tube, Class-A, with zero feedback, utilising a total of four long-life tubes (2 x 6H30 as the drivers and 2 x 6922 as the amplifiers); and furthermore, it is a true dual mono circuit design in both the input and output stages, with the support of two volume control transformers. 
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The Magnetic R-TI is a direct upgrade from the Audio Music reference version of the magnetic passive preamp, which already delivers an exceptional performance over other similarly employed designs, by using both tube amplifiers and output transformers. One great advantage of this magnetic feature is that it is capable of optimally matching any power amplifier and interconnects, while accepting inputs from any sources of various impedance levels, with the least possible interference to the signal.
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The power supply in the R-T1 is also dual mono. The main power transformer, which is used to power the audio circuit, and Mosfets, that are used for both the voltage stabilisation and for a constant current supply. This enhances the reliability, and makes the tube amplification as linear as possible.
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With its great build quality, audiophile grade components, versatility and the ability to musically transform any system, not only does the AM R-TI deliver striking clarity and detail that presents instrumental timbres and textures in an amazingly lifelike way, it also represents great value, with great reliability and stunning looks.
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Above information taken from AM Hi-End Website.