"Bendzh" wrote in message
ups.com...
Slapping the head does nothing, and I have the lamp holder
screwed in
tight. The buzzing's continuous but gets softer and louder
as the bulb
is brighter and weaker.

Check the lamp itself and the condition of the contacts
in the holder. If the lamp socket or lamp base are corroded
they may have developed intermittant high resistance which
may also cause the buzzing. Of course, also check the
wiring.
A voltmeter will also be helpful in discovering if the
output of the transformer is varying around.
The source of the buzzing may be difficult to localize. A
makeshift stethescope will help. This can be no more than a
stick of wood or even a long pencil. Hold one end against
you ear and poke the other around where you think the sound
is coming from. Sometimes this will locate the source. Its
an old auto mechanic's trick.
It is possible for the lamp itself to be producing the
buzz. Lamps sometimes do this when near the end of their
lives. That might also account for the variation in
brightness.


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Richard Knoppow
Los Angeles, CA, USA




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