I don't know what you mean by the green one. The original transistor was an RCA 40410 which is a TO-39 metal case transistor that was welded to a heat sink.
Later versions of these amps used a RCA TO-220 with a plastic body that was riveted to a metal heat sink. I don't remember the KEI part number for that transistor, but sometimes the plastic molded cases were red or green.
Please describe the transistor and any numbers, etc. printed on it.
I would love to post a picture (it would be easier) but apparently I need 10 posts for that..I have no idea I've done.
Anyway, it's green, rectangular, and has LECG292 - 274 - and the last line I can't tell if it's right side up or upside down.
It's either 2S08HSY or Y(upside down) SH8052
Is the transistor flat on a u-shaped metal heat sink with three flat leads coming out of one edge? If it is then it is a TO-220 case and the basing will be different than the NTE129. If the transistor is a round metal cased unit with the lead coming out of the bottom then the NTE129 will fit the same pc pattern.
Wait a sec, could the lettering be ECG292? Do the leads fit the board directly or is the transistor mounted standing up with the legs twisted around to fit in?