After discussion and experiences of other MIC Kenwood revivers MC60 I was warned that the modification of the connection on the connector pin 7 with 8 is not suitable due to bypassing the filtering in TCVR. So I am attaching an even more correct option to connect pin 8 of the MC60 mic connector with a suitable wire to the minus item at the connection point - the battery pole. So I leave it to trial and successful use. I didn't consider it necessary to look at the wiring diagrams, because it works for me in this modification at the moment.