These Negistor experiments were proposed by Jean Louis Naudin: http://jlnlabs.online.fr/cnr/negosc.htm

Here is one of his circuit:

And one of his results:

JL Naudin had also got some interesting results with a load: http://jlnlabs.online.fr/cnr/ndrload.htm

For example: with a replication of this Zon's CCT: (overunity.com):
 
 

I got the following results:
 
 

Yes, about 58 MA sounds even too much and Zon seems  to have obtained best results; but I did not follow his coil specifications and did not use a magnet. I used a 1300 maH 1.2 Volt nim bat. and was able to light 5 white leds during about 35  hours (ie = 9 + 10 + 12 + 4 hours). I did not try more LEDs. No 'OU' here but 1300/56.6 = /= 23 hours and the small  flashlights that are presently sold need 3 * 1.5 volts batterries. Thanks Zon...

I have only replicated the first (no-load) tests with very differents values. Why? just because I missed the JLN's page about the 'load tests!' :((.

This Negistor is very simple to built  but, needs a precise tunning of the input voltage. IMHO, it as very little chance to work with a mere battery, you need a variable DC supply.

Date of the experiments: April 02-07 - 2008. - The pictures are 'clicable'.