LMNC MS20 Filter Low Output

Did you read this?

If the circuit is built correctly the control current to the LM13700, which is the main suspect if one blows, should be safe. You need to verify the 10k resistors. Measuring resistances in circuit is rarely useful, but you can at least verify the color codes are correct.

Other than that:

And yes photos (top and bottom) would help.

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