SGG — "double spark"
in order to get an “extra” energy from spark gap oscillation needa find a way where it might come from; so just got a thought of possibility to obtain it from a secondary spark gap as a current formation part, similar to lightning to get discharge for a short period of time when the cap in secondary part of circuit getting charge from coils oscillation; when it charged it’s just discharges to ground with so needed hi current, and since secondary coil is just a big capacitor it’s capacity might be amplified by adding a big dome- or plate-like surface capacitor
