mj2955 is not a secret house part; it is a very common PNP power transistor. It's basically the opposite of the 2N3055, which goes with your RCA 480058A. Motorola, Onsemi, and others made a lot of them. You want a TO-3 case with an audio-safe SOA and a Vce of about 60V and 15A.
The MJ2955G...