The old "Flyback" was just that, just like you originally mentioned about the 10-15 cycle ringout only you don't get a ringout exactly like that because on the + oscillations, the HV rectifier diode conducted and put the electron (picture) tube in the circuit (loaded the transformer) and having high voltage and beam current (V x I x Time = watt seconds/second) you were dissipating the energy stored in the flyback when you ramped up the primary current.....at a 15,750 Hz rate.......watt seconds x your rep rate of 15,750 Hz is volt-current-time x repetition rate is Watts because the time and frequency are inverse to each other and cancel out.
The Capacitor across the tube (filter capacitor to feed the tube when the flyback was swinging through the negative half cycle) was made by coating the outside of the picture tube with a conductive material like the "Aquadag" high voltage coating on the inside of the rear of the bulb.....definition of a capacitor, 2 conductors (graphite on the inside and outside) separated by a dielectric (the glass envelope of the picture tube). The flat face area where the phospor is illuminated by electrons accelerated by this high voltage (26kv on the larger sets of the day) was not coated. If it were you'd see nothing. The outer coating of graphite had a spring loaded "conducting" wire across it, touching it, which connected to the TV chassis to complete the circuit aka ground the high voltage output. Boy it's been a long time.
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