S100 Buss extender boards

All: Part of the goodies that came with my IMSAI was a buss extender board which has a logic probe on it, which I definitely use for troubleshooting this stuck bit problem. One of the transistors on the board has a lead that's broken at the case. The designation on the transistor is "F444". There's a second transistor marked "F137" which also seems to have shakey leads. The board is manufactured by Mullen Computer Boards, model TB-1. Can anyone cross these numbers to a current replacement? Googling has come up with a possibility for the F444 but nothing for the F137. Thanks. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/