My problem with tube DAC's is there is always a big compromise, either its just a cathode follower after an opamp or its a gain stage after a too large I/V resistor which causes non-linearities with the DAC chip.
Has anyone ever tried a phono preamp (minus the RIAA eq) as an analog stage for a current output DAC like the PCM1704? It has been shown elsewhere that the PCM1704 performs best with an I/V resistor smaller than 10ohms which requires a lot of gain. The first phonostage would basically be working like a step-up transformer in the old audionote patent. My concern is if the phono stage would be quiet enough to handle a mV p-p signal ?
Has anyone ever tried a phono preamp (minus the RIAA eq) as an analog stage for a current output DAC like the PCM1704? It has been shown elsewhere that the PCM1704 performs best with an I/V resistor smaller than 10ohms which requires a lot of gain. The first phonostage would basically be working like a step-up transformer in the old audionote patent. My concern is if the phono stage would be quiet enough to handle a mV p-p signal ?
A MC phono stage has to handle sub millivolt signals, and a good one is down near the theoretical absolute as far as noise goes. No idea what a Tetra Phono pre is - but a good phono pre (without the RIAAS eq of course) is pretty much perfect for what you are suggesting.
Regards, Allen
Regards, Allen
Hi Allen
The Tetra Phono Pre is from John Broskie Tetra Phono All-in-One & Broskie Impedance Multiplier
Regards
Franz
The Tetra Phono Pre is from John Broskie Tetra Phono All-in-One & Broskie Impedance Multiplier
Regards
Franz
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