I think the patent is very clear about the tube:
1. An electrical conversion switching element tube comprising:
a closed insulative housing (50);
a first low-voltage anode (32) mounted internally to said housing and extending internally to an electrical discharge area (62), said first anode adapted to be connected to a voltage source external to the housing;
a second high-voltage anode (12) mounted internally to said housing and extending internally to said electrical discharge area (62), said second anode also being adapted to be connected to a voltage source external to the housing;
electrically conductive means (34b) positioned internally within said housing and extending circumferentially about said second anode while being directly exposed thereto but not conductively connected thereto but, rather, spaced therefrom for receiving an electrostatic charge from the second anode when a discharge current is triggered across said discharge area between said first and second anodes, said charge receiving electrically conductive means also being internally mounted to said housing; and
an output terminal (60) communicating with said charge receiving electrically conductive means, said terminal adapted to be connected to an inductive load externally of said housing.
2. An electrical conversion switching element tube as claimed in claim 1, including a resistive element (30) in series with said first anode.
3. An electrical conversion switching element tube as claimed in claim 1 wherein:
said charge receiving electrically conductive means is tubularly shaped.
4. An electrical conversion switching element tube as claimed in claim 3, including
a second tubularly shaped charge receiving electrically conductive means (34a) positioned circumferentially about said first mentioned charge receiving electrically conductive means.
http://www.google.com/patents/US4661747Also after the calculations were done it was said that a battery that would drive the load
normally for 4 minutes would drive the same load in a Gray system
for 25 minutes because the Gray system collectes and stores back in the battery, the Back EMF from the load.
I say this because it indicates that this system is
more efficient then regular not BEMF collecting setups, and Gray never speakes of a situation whereas this system can provide overunity or energy forever nor is it a claimed overunity mechanism.
It's just a very efficient way of doing things by capturing and storing/ recycling otherwise wasted energy.
The situation i described yesterday does not apply to the GRay tube that i build, and tested, i was only trying to point you in a certain direction.
You can click my website button for an example of the mechanism i was describing.