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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.
Note re Tubes: