Info from Ed's site @ Great Plains Electronics

Buy from him, he supports the hobby and participates in discussions and may even respond to this post.
Product ID: TIP42C
Transistor, PNP, Power
Discounts Apply !
10% Discount for purchase of 10 or more
Transistor, PNP, Power
Package: TO-220
Manufacturer: Fairchild Semiconductor
Replaces TIP42, TIP42A, TIP42B
Product ID: TIP122
Transistor, NPN Darlington
Discounts Apply !
10% Discount for purchase of 10 or more
Transistor, NPN Darlington
100 Volt, 5 Amp
Package: TO-220
Manufacturer: Fairchild Semiconductor
Replaces TIP120 and TIP121