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Old 15th Nov 2017, 4:46 pm   #52
russell_w_b
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Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,684
Default Re: GPO 332 transmitter issue

Hmmm... The loop should be open-circuit when the mic is removed. I'm thinking 'dodgy capacitor' now. But, before snipping the wires off (if you do this, either tape them up or sleeve them, and don't worry: the tele will work fine on a plug-and-socket arrangement without either cap) could you:-

Remove the mic and measure the resistance between terminal T5 on the telephone terminal block and terminal T4 on the dial terminal strip? Compare this with resistance measurement between terminals T5 and T4, both on the telephone terminal block. Should be the same: open-cct.
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Russell W. B.
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