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reference to the use of step-up transformer, we could call "duty" heads with only 1 ohm, with those from 2.5 to 3 ohms of the concerns I, with the heads from 20 to 40 ohms would be a duty to do without it ... with those of 240 ohms there own.
With the same pattern, I'd change strategy:
For some time not fiddled with the NC20, but the memory that I hold is the subject of the Empire, with a 20 mA EC8020 swings with ease and distortion below zero (due to the valve) and this also confirmed Jakelich me.
I remember a meeting held one evening long ago, in the laboratory of Brunetti (musical instruments), agreed: the owner of Audio Note Interstage (the model soon, designed to drive a PSE 845), Mr. Mariani (Graaf) and myself with the NC20. We got to the test with DC injection, because, with unanimous consent, it seemed just the way the NC20 tore the Audio Note UK already in the test instead. What happened 5Kohm connecting a resistor on the secondary (and in parallel with the measuring instruments), gradually nurturing the primary with a Variac. At one point, the sine wave is distorted Audio Note with a pronounced hump on the top, Tango NC20 instead held on for a blow when he began to tot and distort the appearance of sinusoid was less ugly.
The NC20 is in the top 5 best interstage of all time, and among these, it is in the second half.
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