
So I decided to have a go and took out the minute electret and fitted a bigger one a Panasonic behind the grill and mounted on a metal plate as seen in the photo

First contact afterwards was Saudi Arabia 🇸🇦 with a 5/7 and strong audio reported from the Luiton, around 30 watts and President Himalaya WB so seems the modification works at the moment
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Factory fix mod ,we had similar issues with McKinley Microphones ,put them in centre work far better.
Glad mod works ,feedback needed back in factory Simon.
Well done
Rob.P
RPC Systems