On Tuesday, August 1, 2017 at 5:52:31 PM UTC-4, jethro tull wrote:
I have a sony walkman, wm-f23, a 1989/90 device I think, which I'm trying to
identify a component it uses. This is a SOT23-3 PNP transistor marked "94 F".
Actually the "94" is underlined at the left and the "F" is much smaller at the
far right. I think the latter is not related to the chip identification but
maybe to processing plant or other thing. This transistor is used to preamplify
the signal out of the tape head before going to the main audio amplifier which
is the sanyo LA4570, an SOIC-16-N chip. Here is the photo :
http://cdn.sur.ly/favicon_sur.ly_white_32px.png

Near as I can tell, this is a DTA114. If I get a chance, I'll look up the service manual and verify.

Dan