Input of phono stage is far from optimum from the standpoint of cartridge loading. Use the high level input and you have the noise equivalent of the thevenin input resistance of the cartridge resistance plus those resistors - far higher probably than the cartridge itself, and particularly compromising if a good HOMC is used with its inherent low dcr. The low level input loads the cartridge with a very nonstandard load resistance which may result in HF response aberrations in the case of typical MM cartridges. Better to go with a standard 47K input load resistor and dispense with the option of high or low level inputs.