From German forum
Wie bereits erwähnt, transformieren die beiden Transformatoren das eingehende Audiosignal auf eine höhere Spannung. Jeder Trafo für einen Stereokanal. Das Übersetzungsverhältnis liegt bei 1:60 und bedeutet beispielsweise: Wenn 1V Audiosignalamplitude ansteht, dann werden daraus hinter dem Trafo 60V. Sind es 3V, werden daraus 180V. Dieses hochtransformierte Audiosignal wird pro Wandlereinheit an die beiden Statorenhälften (-seiten) angelegt.
the question is how many watts from amplifier is needed for the transformer/psu to run the phones
I can you not offer a minimum value at the moment. But for this reason I use during my visit (quad-Musikwiedergabe) my CEC HD53N Headphone-Amplifier. I wanted to know how well it works. The performance of the HD53N, depending on the impedance between 10 watts and 18 watts. It worked very well. No audible performance degradation. The volume control range was not at the right stop. I moved on average depending on the CD from 11:00 clock and 14:00 clock potentiometer position. Required classical Tuti inserts came with the necessary speed, power and self-evident. Thus I can say: The power of HD53N revealed no problems. It is of course no harm, to provide them with more power. The Einstein-tube amplifier, which is normally used for quad-Musikwiedergabe for the presentation has much more power. I think about 80 watts into 8 ohms. With this amp all the music is more a matter of course, sovereign, and the pulses have more power. But to me it was to see whether the performance of HD53N enough to work without problems. And this was so.
Perhaps one more addition: The old Quad II amplifier (he makes about 15 watts) worked without problems on the previous PSU (transformer transmission ratio 1:30). Theoretically, one could even say that at the current power supply (1:60), even the half-power (7-8 watts) would be sufficient. However, theoretically. The 15 watts of the old Quad II amp is adequate in each case.
Edited by michaelxray - 8/7/12 at 4:08am