Help identifying a Motorola transistor (in HP 7908 PSU)

[Tony Duell]

> 
> At 01:26 PM 11/11/05 -0800, Brent wrote:
> >David Comley wrote:
> >> 
> >> I have been trying on and off for a while to map out
> >> the schematic for the PSU of an HP7908 disc/tape unit.
> >> There's a transistor I can't identify on the board and
> >> I am wondering whether anyone can ID this thing for
> >> me. The markings show "239" and then the batwings, and
> >> then below that it says "4-456". Same problem for a

4-456 is almost certainly an abreviated HP house code. The full version 
would be 1854-0456. From that first part of that (1854), it's almost 
certainly a silicon NPN device (1853 would be silicon PNP, 1855 an FET, 
1850 germanium PNP and 1851 germanium NPN, I think).

Amazingly it's in the equivalents list I have. It crosses to a TIP41A. 
Would that make sense?

-tony