The left and right halves of the circuit are maked "MC head amp" and "Phono EQ amp" respectively. The RIAA network is right there in the circuit, bottom right, where is says "NF型EQネットワーク".
I can't quite work out what this circuit is for. It clearly is not for MM as the input impedance is far far too low. It clearly is not for MC as the input noise is far too high. It clearly is not intended to have accurate RIAA equalisation as the open loop gain is insufficient and depends too much on valve parameters.kingneb said:Hi, I have a circuit I came up with that uses a grounded grid feedback configuration.