PN junctions actually run on a curve. And there is no junction sized step loss emitter to collector. Enough current pulled out of the base and all is fine. Drive it to ground just fine. Emitter to base is another story... Bi-polars are still popular against FETs, but driving that base has been their Achilles heel. Nobody likes the relatively low gain factors or input impedance problems.
The main advantage as you say is clean switching and stable firing. Contact are a real problem at very slow mechanical rates.
Why Pertronics uses a DC approach to working the coil is beyond me.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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