XPost: uk.d-i-y   
   From: headstone255@yahoo.com   
      
   On 06/10/2021 21:54, Ian Jackson wrote:   
   > In message , David Wade    
   > writes   
   >> On 06/10/2021 18:47, gareth evans wrote:   
   >>> On 06/10/2021 18:43, gareth evans wrote:   
   >>>> I have been called uppon by SWMBO to repair her Pifco Xmas   
   >>>> tree lights which she purchased over 5 years ago.   
   >>>> (Yes, we have plenty of modern LED versions to   
   >>>> replace them)   
   >>>>   
   >>>> 1. The instructions say that if one bulb of the 20 fails,   
   >>>> then the res will remain illuminated. What's the technology   
   >>>> here because they're all wired in series?   
   >>>>   
   >>>> 2. Is the Fuse Bulb a capacitive unit, because I get a momentary   
   >>>> flick of the ohmmeter?   
   >>>>   
   >>>  Sticky key ... 50 years ago   
   >>>   
   >> The bulbs are designed to fail as a short circuit. So as more fail the   
   >> others get more overloaded ...   
   >>   
   > Yes. The filament support wires keep it under tension. There's a loop of   
   > wire welded to one of the support wires, and it loops around the other   
   > support wire (but doesn't touch it). If the filament breaks, the support   
   > wires spring apart, and the wire loop shorts one to the other.   
      
   Interesting.Time to get out the magnifying glass and be curious tomorrow!   
      
   73 ES TKS IAN!   
      
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