The tubed output stage operates differently to the solid state logic one. The Tube stage operates as linear Class
Amplifier and does not "saturate". The normal logic IC based output buffer circuitry operates in "saturation" meaning
it is slower to react to signal changes. The Tube stage also has much less input capacitance than CMOS logic IC's, so
the rise-time of the signal is faster.
The technical result is a signal output that is cleaner and closer to the theoretically "ideal" SPDIF Signal.
As a result the DAC's SPDIF receiver can recover the signal and clock with less jitter, in technical terms. This in turn
generally produces a better, more natural and non-fatiguing sound.
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Topic - What makes the tubed usb to spdif converter better the non tubed version? - bcherry 02:38:23 03/29/10 (0)