Sorry, I was away. I think the contribution of resistors to sonic quality is proportional to their voltage coefficient and to their noise at the particular position. But the major factor is the ratio of output voltage change per resistor value change (i.e. sensitivity). In other words, the larger is the change of the output voltage per resistor value change, the bigger is its influence to the sound. It also depends on whether they are connected to a high impedance or to a low impedance point. This is my theory, not necessarily true.dikarner said:
That said, I think the bigger influence points are R6, R7, then the RIAA resistors R8, R9, R10, and finally R12, R41, R42.
I can imagine a test where the resistors would be changed by 10% one-by-one and the output voltage change would be be precisely measured for each of them. Or use a SPICE simulation in order to determine the sensitivity of the output voltage to each resistor value change. Edit: where the resistance change is caused by the AC voltage on the resistor. The one causing the largest change has the most influence to the sound, and using an audio grade resistor is validated at that position.
I actually decided to go for the VARs (TX2575) - in some places the less expensive variety TX2352 from www.texascomponents.com
I am increasing the size of the coupling Cap(s) to around 180n get away with smaller gird resistors (100K is MUCH cheaper the 400K).
The Mills seem to be a good choice for the Anode-resistors which should be able to handle at a minumum 2 Watt.
I am increasing the size of the coupling Cap(s) to around 180n get away with smaller gird resistors (100K is MUCH cheaper the 400K).
The Mills seem to be a good choice for the Anode-resistors which should be able to handle at a minumum 2 Watt.
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