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Re: 1256D Paralleling Choke



Original poster: BunnyKiller <bunnikillr@xxxxxxx>

Hey Cameron...

I would go ahead and use both stacked together to make it " 2.5 X ??thick" and carefully watch the voltage differences between each output.... if there is much more than 5 volts between each leg you will need to go to a larger core ( a small variac core minus its original wire)

to test voltage between legs, VOM the neutral and one leg ( approx 120 - 140 V depending on how you have the varaic set up) and repeat for the other leg. If voltage difference is same/equal or less than 5 V difference, then you are ok if not, start looking for a 7.5 amp variac on Ebay ;)

next step is to load the variacs with something that can pull a decient amount of power ( approx 20A) and retest the voltage differences between legs...

I am assuming that you are running 240VAC opposed phase ( single phase in more common terms)....


Scot D




Tesla list wrote:

Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>

Hey guys,

I've got 2 1256's I've mechanically ganged together. I now need to build a
paralleling choke for them. I've read some posts and websites on how this is
done, but they talk about using an old variac as the core. I have a ferrite
torroid that measures 2.25 inches O.D. 1.50 inches I.D. and is .75 inches
wide. I believe the core is physically large enough to get 16 turns of 8AWG
around it, but I'm concerned if the core is magnetically large enough or
not. Any thoughts about this would be appreciated. I do have two of these
cores, so I could stack them and wind through both at once if need be.

Thanks,
Cameron