1897-010 Doorking Mirophone unit now comes as 1998-020 kit

Replacement mic works well. Depending on your exact model the wiring connections may require slight modification. I have two Doorking units and the connections were a bit different in each. But I was able to replace both mics in both of the units successfully.

I can't fault Gatehouse for the only flaw: the adjustment potentiometer is on the wrong side of the Printed Circuit Board, making it difficult to adjust for feedback. You have to remove-and-replace the board to adjust and test.