Peter, thanks for your honest answer. John said we need a perfect 50/50% flip flop, that doesn't mean the duty cycle has to be 50% in amplitude though right? Especially if we are to block electron flow but then I don't understand the 50% mechanical pulse width on the T7 rotary switch. T1 one would make more sense since the coil controlled transistors would only allow for very short spikes(more John-like. Is T1 exactly like John's cigar-box or could there be missing parts?

best regards, Mario