B1560 is not available in the market.

Don't know this particular transistor but most of the B#### transistors were manufactured by Bendix Corporations Semiconductor Division at South Street, Holmdel, New Jersey 07733. I think most if not all were Germanium PNP high power transistors in TO3 cases. It's just possible that some surplus dealer or electronics buff around Holmdel may have one in the junk box. If not look for a replacement with capability of handling the specified channel power output at the supply rail voltage. Gain is probably not too critical.