small circuit improvement
This is not much of an improvement, but it does help some. I changed the 1K resistor to 200 ohms and the L2 coil diameter from 4.5" to 5" and moved it to about 2.5" from the end of L1 instead of 1". This gives a small improvement in the distance from the L1 coil that the 4 watt tube will light when using a single 1.5 volt AA battery without a cell phone charger.
YouTube - 1 5V battery no cell phone charger
This is not much of an improvement, but it does help some. I changed the 1K resistor to 200 ohms and the L2 coil diameter from 4.5" to 5" and moved it to about 2.5" from the end of L1 instead of 1". This gives a small improvement in the distance from the L1 coil that the 4 watt tube will light when using a single 1.5 volt AA battery without a cell phone charger.
YouTube - 1 5V battery no cell phone charger
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