ProtoDAC TDA1387 X8 project

[hifinet]

@thomaschan This reminds me of a favorite FET preamp from Audio Amateur in the 70's. A single stage FET common source amplifier is essentially a single ended triode, without the heater supply. THD will be in the 0.1-0.2% range, and with the proper part, mostly H2. The best sounding tubes have low THD, almost all H2 and virtually no H3. THD with the FET circuit can be lowered by increasing the supply voltage with excellent voltage regulation.

The output of TDA1387 X8 is up to 800mV with a 100 ohm I/V resistor. I wonder if that is high enough to be fed directly to the MBL6010 based preamp. Does it have enough sensitivity, gain and is it low noise?

In the D1 thread, the consensus was that the best sounding circuits have the lowest parts count with the shortest signal path. In that circuit, they used high output MOSFETs in a simple circuit and cranked the voltage up to +45/-45V to get lowest THD.