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Old 15th Nov 2017, 10:35 am   #37
bigus01
Retired Dormant Member
 
Join Date: Nov 2017
Location: West Yorkshire, UK.
Posts: 38
Default Re: GPO 332 transmitter issue

OK, I have wired as per Russell W.B's instructions and put a strap between T4 & T5 on the dial contacts terminal. This has the result of reversing the polarity in the handset and increasing voltage to 9v dropping to 5. Again the carbon inset works fine, but not the electret.
Regards
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