By the way, that RC between output and ground is for helping LM317's stability. A cheaper 47uF electrolytic capacitor alone could do that trick instead of the 0.47uF 630V Wima MKP and the 4.7 Ohm resistor to give it artificial ESR. Maybe the original link's guy didn't have a high voltage electrolytic handy. Or he wanted it to sound different (kinda speedier/cooler), who knows.
I guess a footprint that allows either of the two caps could be an option. The 4R7 resistor could be shorter with the electrolytic.
A minor mystery of the schematic is the lack of R3. Probably never been there.
The 6N2P input stage valve in this phono does have a screen connected to pin 9. But 50dB separation I have not met on test discs. Usually 20-25dB and up to 28-29dB at 1kHz for carefully assembled carts using line contact stylus when the whole vinyl rig is geometrically very well set. Most of the times not even reading the same figure between channels.
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