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Old 16th Feb 2018, 9:05 am   #36
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
Default Re: Kellogg wall phones - need help

Congratulations. It's good to know that you are now up and running with your 'phones.

The fact that the newer handset has a weaker transmitter may indicate that it is a poor match for your 'phone, being intended for a more modern 'phone, rather than having a fault in it. It may be worth looking out for a handset of the correct era. It may also be worth experimenting with an increase in battery voltage on that 'phone - though if it's an electret, I wouldn't expect it to work at all at 1½V.

Incidentally, it sounds as though you may have had to "wake up" the carbon granules in the older transmitter. They can settle and stick together after extened periods out of use, so agitating them gets them working again.
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