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Hopefully you didn't blow the input...you say the input is rated for 51mV=.051V, but you connected a .500V cartridge that would feed it 10x it's rating... unless you misreported those numbers the cartridge should be too strong for the input.
Does the input selector have 2 different phone positions for the 2 inputs or is there a switch somewhere that selects which is the active phono input? If the latter have you verified that switch is in the correct position and toggled it between the two to clear tarnish from the contacts?
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