The NTE247 (NPN) and NTE248 (PNP) are silicon complementary Darlington transistors in a TO3 type case designed for general–purpose amplifier and low–frequency switching applications.
Full spec sheet:
https://www.nteinc.com/specs/200to299/pdf/nte247.pdf
NTE247 NPN 100V 12A Darlington Power Amp TO-3
SKU: NTE247
$6.77Price