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    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Inductance coupling between chokes


I recently redid my phono power supply with three chokes, with three stages. The last two chokes are parallel to each other, the second choke (mid voltage) produces 4-5mVAC, while PSU Designer shows choke one with way below 1mVAC. My question is, since there is excessive output noise now from the preamp (used to have, LC,LC,RC PS stages), could there be inductance coupling occuring between the last two chokes (overall inductance is now greater, so this came as a surprise, all I can think of is coupling)?