ProtoDAC TDA1387 X8 project

[hifinet]

Finally tried the Rhopoint 8G16D Econistor 100R I/V resistor. Green and shaped like a rocket with a cone on one end. Supplied by Farnell Ireland via Newark USA. Farnell stocks only 14 values of the Rhopoint. Same preamp setup as the 100R TX2575. These resistors sound very nice. Deeper soundstage, but it is not as large as the TX2575. I thought some of the diminished depth of soundstage with the TX2575 100R was due to the preamp. Some of it seems to be due to the resistor itself. These are not quite half the price of the TX2575. I think I still prefer the TX2575, but the decision is getting more difficult.

The next one will be the Rhopoint 5G10D in 350R. No preamp, back to the single module ProtoDAC.

Update: It may be that the preamp is breaking in. It is the MOFI Accuphase C3850 clone. I have fixed 100K load resistors on the input. PGA2310 volume control at the output. DC offset is <1mV. It is a NE5532-diamond buffer-VAS-diamond buffer with global feedback within the feedback loop of the NE5532. All transistors BC550/560. It could be a headphone amp. It sounds extremely good with the Rhopoint. I will need to go back and listen to the TX2575 again.