View Single Post
Old 11th Nov 2017, 11:25 pm   #19
DrBagPhD
Retired Dormant Member
 
Join Date: Nov 2017
Location: Glasgow, Scotland, UK.
Posts: 7
Default Re: Converted GPO 332 (mk1) receiver EXTREMELY quiet, help!

Quote:
Originally Posted by Dave Moll View Post
Have you checked the carbon-granule transmitter inset. If this is open-circuit, that would cause the symptoms described, including the sound level returning to normal when its DON contacts (labelled "B" in post no. 8) are closed.
Quote:
Originally Posted by russell_w_b View Post
You could short out the mic temporarily to prove this.
We have a winner! Shorting the mic contacts produced a dialtone. It turns out the contacts for the transmitter were pushed quite far into the handset, and the transmitter itself was rather grimy. I cleaned it up with some isopropyl alcohol and gently bent the pins outwards. That seems to have fixed everything, especially thanks to Russell noting the cam on the dial needed adjusting.

Thanks to you wonderful lot I now have a fully functioning telephone.

Thank you all so, so much! I can't express how grateful I am that the phone is now working.
DrBagPhD is offline