I have had a small lamp on my bed bookcase type headboard for years. The
pivotable arm finally got so loose it wouldn't stay put. Picked up
another one at an estate sale - that worked fine. Trouble with it turned
out to be a constant hum from the voltage reducing xfrmr - even when the
lamp was switched off. It used a #93 automotive bulb.

I finally got disgusted with it and bought a new one - halogen - which
does not hum when turned off.

Tore (literally - the screws that held it together were imbedded 1
1/4" deep and had a head that matched  nothing I had) the old one
apart. The idiots had hard wired the input of the voltage dropping
transformer directly tp the 110 V AC input. The on/off switch only
switched the 12V output! No wonder it hummed when turned off or on!

Jay
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