The NTE245 (NPN) and NTE246 (PNP) are silicon complementary Darlington transistors in a TO3 type case designed for use as output devices in general purpose amplifier applications.
Full spec sheet:
https://www.nteinc.com/specs/200to299/pdf/nte245.pdf
NTE245 NPN 80V 10A Darlington Power Amp TO-3
SKU: NTE245
$5.95Price