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Sorry, nobody seems to know what the transistor is for. I thought is was one of the TIP series, but there is no such thing as a TIP638 transistor. Could you provide a circuit that the transistor is used in?
This is used on a German made Casette deck, it is used in many places, to control the motor or to regulate the supply voltage... the diagram that I'm icluding is for the voltage regulation... I hope is clear enough...
Just for documentation purposes: I successfully replaced the s7267 by the BC368. Any other NPN transistor with enough power would also do but the BC368 has the same pinout (ECB) as the s7267. The most of other transistors (for example the BC337) have the CBE pinout.