The inductances of the transformer is just a wild guess, so the oscialltion frequency is also. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. I am attaching a screenshot of the analysis I ran of it. Cross section of 2N2222 in metal TO-18 package, showing connection wires between external pins and die. But in any case, LTSpice says your circuit works. Oscillators are tricky circuits, and in my opinion their designers are magicians (especially those YIG oscillator guys). You might also think of the transformer as the feedback path that provides the necessary phase-shifted feedback from the collector (output) back to the base (input). That phase shift is what causes the circuit to oscillate. time signal, but with a phase shift between them. In this circuit I suspect that phase shift is the most important feature of the transformer, allowing the collector and base to see the same voltage vs. But it would couple the two sides of the circuit, while providing a phase shift between them. So you are right, this transformer would not boost voltage. This type of transformer is often called an isolation transformer. But a transformer can have an equal number of windings in the primary and secondary, in which case it does not increase or decrease voltage. Confusion arises because common transformers step voltages up (or down). So while your component isn't "an inductor", it is "two inductors". Of course, a transformer is just two inductors with linked magnetic flux. Also, the dots and dashed lines indicate "transformer". Since this thing has four terminals, it can't be an inductor. First, an inductor is a two-terminal electrical component.
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