Hi Have you tried a new Mike?
Sometimes the switches internal contacts get gummed up.
You can try TV tuner spray into the switch from the inside.
You will need to open the mike to do this but that is easy to do :-)
Please don't over spray and work the switch while making sure some of the spray gets into the switch contacts. That will likely fix this but I will stick with you until we have this all worked out.
Please also do not get any of the spray on the Mike element! That will ruin the element.
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as I said tried three diff sets complete with mics plus one new mic Is there any way of getting a signal test strength with-out a set connected danny