It’s most likely it will not work. Most phono preamps do not have enough voltage to drive a power amp. You will need to know the output voltage of the Project. I doubt that it is more than 1 volt!
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It’s not a phono preamp.
You can easily use it as a pre-amp. It uses an ESS DAC, so it uses its its own internal 32Bit datapath to do volume control, so no issues.
Yes, it is a headphone amp, preamp, and DAC, hence my interest. Likely use it with a Dynaco St-70 having 1.34V input sensitivity and a NewForce STA200 having 0.45 input sensitivity.
ProJect does make a Phono Box which provides maybe 40dB gain such that with many MM cartridges would not reach 1V output.