View Single Post
Old 28th Jul 2019, 10:22 pm   #3
Dave Moll
Dekatron
 
Dave Moll's Avatar
 
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
Default Re: Wall phone - nothing but trouble, really!

Certainly, sticky carbon granules in transmitter insets account for a lot of problems. If they don't respond to the "sharp rap" technique, the solution is probably to replace the inset. An electronic "transmitter inset 21A" is the most reliable solution as it does away with carbon granules altogether, and is designed as a direct replacement on 7xx series 'phones.
__________________
Mending is better than Ending (cf Brave New World by Aldous Huxley)
Dave Moll is online now