When you ask for help with a part, you need to provide as much information as possible about the application (how it's used in the amp). When choosing substitute parts, you must know what it's doing in the circuit. Without more information, the MJE172 may be a good sub.
KEC semiconductors (manufacturer of this part) doesn't have much of a distribution network in the US. I'm sure that it's readily available in South Korea or China.
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