Messing around inside the IC910 did get me improvements, but it developed a fault.
When setting a frequency, after a short while the dial moves the frequency without any action.
Initially I suspected that the switches in the microphone had got faulty, but this happens even with the microphone disconnected.
Then there are two more obvious possibilities:
a) Dust has entered into the the rotary encoder, or
b) A flat cable has a poor connection.
So tomorrow the radio goes on the lab desk again, let us see if we can get rid of that annoying fault.
Yes, beware when you mess around inside an older radio.
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