GPO 332 transmitter issue
I have a 332 phone fitted with a 184 handset. The phone works fine with the original carbon transmitter. To improve outgoing sound quality I have tried to upgrade to an electret microphone. For some reason, despite connecting to the same contacts as the carbon mic it will not work. I have tried a genuine 21A GPO transmitter and also the cheaper alternatives with no success, refit the old carbon and all's fine again. Any idea's gratefully welcomed.
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