I always start with tubes.
I wish people could use vacuum tubes.
Remember i told you that it was easer to experiment with tubes.
However if you NEED exact frequency then use tubes.
It should be a lot easer to use tubes.
Using tubes to control the unit is easer at first TUBES are NOT as sensitive as SS control devices and DO NOT require the massive amounts of feed back to operate.
There is an advantage in tubes just from that standpoint alone
It was much easer to make one of these things work if you use tubes as a control system
Use tubes from the beginning and then try to switch to SS for the control unit.
I have said, there is a difference between solid state control devices and tube based control.
I believe it has something to do with the fact that solid state devices in of themselves are so very dirty and also that they require such a large amount of feedback to operate.
Tube control systems are stable in themselves!
I am sure this will be helpful to anyone who has not been able to understand why using tubes to control the unit is easer at first then trying to use solid state devices in the beginning of research.
NONE of us could think of a reason why SS devices would not work. After all they did the same things as tubes, just better, didn't they?
The reason it took soooooo long to make a successful SS control unit is because we maintained that attitude for so long. Finally we came to the conclusion that there must be SOMETHING that tube control devices did differently then SS devices.

That would depend on how you define core.
If you mean copper collectors,then yes i use a core...
But if you are talking about a ferromagnetic core or a core like in transformers then no.

Why?
Because IT DISTURBS THE EARTHS MAGNETIC FIELD.
Any piece of ferromagnetic metal will alter the field,that is why the units stop when you bring iron close.

Also if it is running UHF or even 245Khz like Steven talked about....which core can handle that Otto?
Don't you know aircore is the prefered methode in high frequency applications?

Steven NEVER mentioned the word CORE in his writings, NEVER so WHY are you talking continously about it Otto??
He did mention TUBES many,MANY times...who is using them?? Besides me??

Why does nobody seem to understand it is a very small road to sucess.
You have to examine the signs and information carefully.
That means there is no room for going off road and do things in a diffrent way....

Marco.

    SM used a negative plasma as a core intentionally or not. Then there seems to be introduced some phased compression of the magnetic field within the copper mass which takes on the form of a coil.
If we replace a choke coils core with a copper core what happens when we hit the copper core choke with various pulses at various duty cycles.  Normally setting and resetting the magnetic domains of the core material converts the hf spikes (kicks?) to heat as the core goes into hysterics.  But with a copper core something else must happen.

Hello, guys!

I've already read a lot of this thread (but not all). Sorry, if this idea already was here? or maybe I've got somthing wrong. I just really want to help you.

I assume that TPU is heating very much, and particulary thick copper wires are being heated.
What if we use not a thick copper wire, but a copper tube with a clean (distilled or not - it is for you to decide) water which is being pumped thru the tube by a small water pump (which is frequently used in small fountains). This tube will be connected with a reservoir with a cold water. This may be, for instance, a central hot-water heating system of your house (if it is a privat house).
Besides that might be possible to use water as an electricity conductor (in this case it shouldn't be distilled) instead of (or together with !) copper conductor you are using now. Remember solder wire from the PDF file - it's negative property is low melting temperature - it's difficult to use it. Water is already a liquid, conducting electricity!
Take into consideration that water is a substance that has very high thermal/heat capacity.
If wated can be used instead of copper, tube can be plastic.
Also it's possible to use any other coolant (like coolant in cars) but I know nothing about their electro-conducting properties.

Thank you for your efforts, I will try to help you as much as I can.