Possible replacement analogs from different manufacturers

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BU903 - NPN Silicon	BU 508(A), BU 908	1350/550V, 6A, 125W
BU603 - NPN Silicon	-	1350/550V, 5A, 100W
BF979(S) - PNP Silicon	BF 479	1350..1600MHz
BU603		1350V 5A 100W 0.7us
BU546		1350V 6A 100W TO3