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Old 5th Feb 2018, 9:27 pm   #6
JHGibson
Retired Dormant Member
 
Join Date: Apr 2003
Location: Salt Spring Island, BC, Canada
Posts: 368
Default Re: Lamp Limiter Bulbs

Those golden glow 'antique"light bulbs have carbon filaments which have a negative temp coefficient. That is when cold they have a high resistance which falls as the filament heats up. They would make a good barretter type dropper resistor which would be kind to the valve heaters and dial lamps. You have to choose one with the appropriate hot resistance.
John.
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