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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 26th Sep 2020, 1:21 am   #21
Join Date: May 2005
Location: Adelaide, South Australia
Posts: 234
Default Re: Rewinding a variac

I've had one of those weeks where there seems to be and endless list of things to do and places to go - none of it for me, so I have not been able to spend any more time on the rewind, I did though go through the old wire I pulled off and checked it with my digital calipers it has not been flattened at the point where the graphite slider picks up the current - it is thinner when measured across the point of contact so for this variac at least I doubt it was flattened, I don't know about other variacs though, possibly they are.
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Old 26th Sep 2020, 6:12 am   #22
Diabolical Artificer
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Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 5,516
Default Re: Rewinding a variac

"I've had one of those weeks" We all get em. My variac does have flattened wire but it's a big 8A jobbie, so bigger gauge wire which would cause a bumpy surface for the carbon brush. Maybe it's not needed on smaller variacs.

Curiosity hasn't killed this far.
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Old 26th Sep 2020, 10:54 am   #23
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Join Date: May 2004
Location: Halifax, West Yorkshire, UK.
Posts: 1,451
Default Re: Rewinding a variac

I'm guessing that this is an early 1A Lyons Variac ™ (licensed by the US company General Radio for production in Australia) with a cylindrical brush so it probably wouldn't have had flattened windings or plating. Later models like my 3A version had the Duratrak contact surface coating and rectangular brushes although I believe that some of the smaller Duratrak models also had cylindrical brushes.


Last edited by ajgriff; 26th Sep 2020 at 11:04 am. Reason: Spelling correction
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