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The headphone volume and impedance settings can be changed by simply moving the jumper location on the PCB. Ample space for larger coupling capacitors on the PCB is also provided.
The power transformer has independent windings for the right and left channel to minimize the interference between channels as much as possible. The filament power uses the latest DC-DC converter with extremely low noise and high efficiency. Schottky barrier diodes and fast recovery diodes are used as rectifying diodes that reduce even the most negligible noise spikes. Listeners can enjoy music free from noise even when using a pair of high efficiency headphones. The main circuit of the power unit is unitised per channel as a module.
Tube Friendly design: Warm-up time for directly-heated tubes and indirectly-heated tubes are different. In most designs, directly-heated tubes warm up faster than indirectly-heated tubes. So directly-heated tubes are often overloaded. With TU-8900, the voltage is gradually raised which reduces the level of overload to the directly-heated tubes.
Option (price on application): specialist Output Transformers from Lundahl of Sweden featuring Amorphous cores. An amorphous metal transformer (AMT) is a type of energy efficient transformer usually found on electric grids. The magnetic core of this transformer is made with a ferromagnetic amorphous metal (non-crystalline with a glass like structure). The typical material (Metglas) is an alloy of iron with boron, silicon, and phosphorus in the form of thin (e.g. 25 µm) foils rapidly cooled from melt. These materials have high magnetic susceptibility, very low coercivity and high electrical resistance. The high resistance and thin foils lead to low losses by eddy currents when subjected to alternating magnetic fields making them ideal for Output Transformers in tube amps..
Note re Tubes: