WFC VIC

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To help you visualize better what stan was using in his multi VICsetup. This is a model with the corresponding dimensions as Dynodon showed when he was there:

“The core was two flat U cores about an 1/8 inch thick and about 1/2 wide. Each leg was @ 2 1/2 inches long, and @ 2 3/4 inches total width. They came together to make a closed core. They looked just like his drawings to the letter. They were a ferrite type material.
The WFC VIC coil is on a two piece U core. The cores were of a powdered metal like ferrite. It had five separate coils on it. Primary, secondary, two separate chokes,(not bifilar) and a pick up.
The chokes for the wfc vic coils were two separate coils of the same size. They looked just like the secondary; I would say they were the same size in shape and wire size.
Every coil was wound with the same size wire. 29-30 gauge.”

Wow that was a very thin and flat U core.
Do you think Stan custom built such cores? Dynodon said that it was a ferrite type material.
We need to know the approximate values for Inductance and determine self resonance.
This is to take also into consideration that this VIC is driving only a small 3inch 0.75dia tube cell.(very small capacitor)

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Nicely done!

Steve

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Nice job with the drawings,looks just like them.The bobbins themselve's were two halves machined out of delrin.The two halfs come together to form the three section bobbin.The bobbin halves when put together have the groove down the center for the core to slide in.Both sets of bobbins on each leg of the U cores were the same size.You could wind the two chokes or a primary, secondary and feedback.The small section in the middle isn't used with the chokes.
 
I have never been able to find that type of U core anywhwere.They may have been custom made.
Don 

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Don,
Do you remember if the core was light shiny grey(like tv flybacks) or dark color ferrite ?
How can we build such core ? Anyone know the process to fabricate a core let say with a usable frequency of 10khz-50khz?

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You could use resin and iron powder, or iron oxide...