![]() In this case, as it has a TO-39 format (up to 3w) and supports up to 300 Mhz, it can be used in transmitters and amplifiers for HF and VHF and even some UHF cases with output powers of 1 to 2 watts. Also the 2N2219 is similar, but for more power. If the circuit is only for small signals, it could be perfectly replaced. You could also use the 2N3904 with very similar characteristics, but it can only carry one tenth of the current supported by the 2N2222.
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