Originally posted by Dwane
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Hello Dwane,
the tower coil look very nice ! 50 cm is good but keep in mind the self resonance frequency of this coil not to be lower than the resonance frequency of ETBC , as Don smith proposed not to make it ground itself for this you can lower the resonance of ETBC, for example if this coil resonate in 400 KHZ you can make the resonance frequency of ETBC at 260 KHZ as example, to see the ETBC oscillate just connect it to Mazzilli driver, A and B is the whole coil , X is where the positive AS follow
don't worry about the torroid if you lower the diameter of ETBC to be near the tower coil , more radiant energy can be sent to the tower to be converted to light the bulb.
good luck
regards

if my analyse is correct i suggest using another thick aluminium foils the same as the proposed video about How to Solder copper wire to aluminum foil,if it's the same Super Strong" kitchen foil please solder it using any mineral oil, sometimes Olive oil do the job !!! you have 4 connections if anyone fail or work partially the system don't work good , this is the first note.
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