Good idea, I will give it a try... I did try with the ground that
comes in with the phone line disconnected, and also tried a different
ground, with no luck. Another phone tech came, heard the hum and said it
sounded like it was the card that generates the dial tone at the central
office going bad. He went to the CO to check it and was to call me, haven't
heard back yet. I don't know if he did anything, the hum is still there.
Thanks for all your help, I haven't given up yet.

"Phil Munro" wrote in message
...
Consider trying this to see what happens. Use an old phone that does
not require any ac power. Use it in a case where the hum is evident,
and turn off the main breaker to your house power. That is turn off ALL
your power at the main box. See if the hum goes away. If it does, then
something somewhere is "cross feeding" from YOUR side of the telephone
feed. --Phil

hank wrote:

I have a hum on the phone line. Verizon has been out several times,
and found no problem. The hum is affecting incoming voice quality,
and the answering machine recording is poor. They did AC voltage,
stress test, DC volts and leakage test. All were "clean". I plugged
in different phones at the NID, and hum was still there.(they say
they don't here it)
--
Phil Munro Dept of Electrical & Computer Engin
Youngstown State University
Youngstown, Ohio 44555