Re: WW2 British ‘L’ Field Telephones.
You say you have added a D size battery holder. How many cells does that have? One, two.....?
I can't recall how many cells they used originally, but if you haven't got enough volts to power the microphone, then that might well explain why they are bit quiet. No doubt an expert on these with the manual will pop up and tell us exactly how many primary cells were needed. As I recall they were square in cross-section last time I used these things (about 38 years ago!)
Richard
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