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To me, I'd pull the MIC right out of the plug and see if the condition clears. Might just have a bad wire in the Mic.

IF it doesn't then it's internal to the radio - then that may be a different and bigger problem - a wiring mishap or the IC a 4558 (8-pin flat package) IC is having troubles - check side and rear panels for heating (2 Regulators) AM Regulator keying up, Shorting problem with the Finals (overly Biased MOSFET's are prone to keyups because of latching issues with the Gate) or the 8 Volts MAIN power Regulator is failing - feeling the panels and if they are hot it is being caused by an internal shorting / latching issue.

[QUOTE="Handy Andy, post: 768164, member: 52309"] To me, I'd pull the MIC right out of the plug and see if the condition clears. Might just have a bad wire in the Mic. IF it doesn't then it's internal to the radio - then that may be a different and bigger problem - a wiring mishap or the IC a 4558 (8-pin flat package) IC is having troubles - check side and rear panels for heating (2 Regulators) AM Regulator keying up, Shorting problem with the Finals (overly Biased MOSFET's are prone to keyups because of latching issues with the Gate) or the 8 Volts MAIN power Regulator is failing - feeling the panels and if they are hot it is being caused by an internal shorting / latching issue. [/QUOTE]

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