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U core vic

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Dave:
well... this is my first try at the U core vic
I couldn't find anything close to the core size Stan was using. Has anyone found one?
Anyway, The secondary and both inductors are 2000 trurns of 29g wire and the primary is 100 turns of 24g wire. The core is ferrite and has a high permubiltiy. I had a miss calulation and it came out with inductors four times the size that I wanted! So I recalculated my resonant frequency. It should be resonating around 1000hz but the highest voltage I get is around 20k and the frequency is half that at the cell. I calculated resonance with the possitive inductor values and water cap values. The highest voltage I can get is around 240 volts at the cell with 12 volts input. I'm still using my old tube cell which is 4 times too big. I'll have my new tune cell done soon, as close to Don's spects as possible.
Anyone have any advice why it doesn't resonant properly? or anything else I can change to get this working properly?
 

Dave:
here is my coil winder for those that were intersted, it makes things way easier but it still takes forever because I don't have a wire guide

webmug:

--- Quote from: Dave on June 14, 2011, 01:04:24 am ---well... this is my first try at the U core vic
I couldn't find anything close to the core size Stan was using. Has anyone found one?
Anyway, The secondary and both inductors are 2000 trurns of 29g wire and the primary is 100 turns of 24g wire. The core is ferrite and has a high permubiltiy. I had a miss calulation and it came out with inductors four times the size that I wanted! So I recalculated my resonant frequency. It should be resonating around 1000hz but the highest voltage I get is around 20k and the frequency is half that at the cell. I calculated resonance with the possitive inductor values and water cap values. The highest voltage I can get is around 240 volts at the cell with 12 volts input. I'm still using my old tube cell which is 4 times too big. I'll have my new tune cell done soon, as close to Don's spects as possible.
Anyone have any advice why it doesn't resonant properly? or anything else I can change to get this working properly?

--- End quote ---
The AWG of the VIC inductors are all the same and the Sec, choke1 and choke2 have not equal wire length.
What high permeability value are you talking about? And what are the core specs?
If you have Unipolar Pulsed voltage at the secondary you are in business.

Br,
Webmug

Steve:
Nice winder ;)

You have a very nice VIC build, Dave!
Maybe you can add a resistor between your cell and VIC.
Question: How many tubes you have hooked up to the VIC?
Its 1 VIC per tube, accoording to Stan and Don.

Steve

jim miller:
This is a very nice build. It appears that when i did the photogrammetry on the VICs that the
coils had more of a random wind.  If the value of the inductor is  too large consider using whatever tubeset you have but use another capacitor in parallel/series to alter the frequency of the LC circuit
 
regards

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