crystal radio: the first real free energy device

[pomodoro]

I was thinking of solid plates, not perforated. These plate would block the charged particles from going to the 8000v plates.

[gyulasun]

Okay but then the question remains whether the electric field strength the 8000V source establishes between the + and - electrodes can have any effect on the alpha particles between the big (light blue) plates? 
If not and the E field is screened by them in the volume / area where the particle source is placed, then I think the load will have a tiny current (if any at all)  flowing in it because there would be no separation force i.e. a dipole for the alpha particles to take direction.

Gyula

[telecom]

Hi Pomodoro,
first of all, your power supply doesn't reflect what Carl Willis used.
If u remember, he said that his ground plates and the grid of wires are grounded.
So, anode is the ground, and cathode is -8000 V.
Secondly, why not to use a high voltage diode to prevent the backflow into the supply?
Thirdly, lets compare to the real triode - it has a very similar system where they r able to separate the output from the supply.
http://www.allaboutcircuits.com/vol_3/chpt_13/3.html

[pomodoro]

Yes gyula that's why I want sure that it would work. Your idea might work if the roles of the plates are swapped. There is a Farnsworth's multipactor patent US2189358, where the potential is applied to the inner thin wire grid, the electrons are attracted by it, but most pass through to the plate behind it, due to their speed

[telecom]

This is an idea attached - I'm by no means an electronics guru.