Those are common parts that Digi-Key will sell if not Radio Shack.
------------------------------ On Fri, May 3, 2013 7:00 PM PDT Hardware Mack wrote: >do those cross reference to something radio shack might sell ? :-) > > >Thanks for looking at that! > >Charles > > > >On May 3, 2013, at 9:58 PM, Blair Aakre wrote: > >> Q1 and Q2 are part of the oscillator circuit. They are both identical 2N4258 >> PNP transistors according to my CPU board schematic. >> >> -Blair >> >> >> >> On May 3, 2013, at 5:09 PM, Hardware Mack wrote: >> >> thank you for that great information! >> >> Can anyone look at their lisa cpu board and let me know what you have in >> that spot? >> >> Thank You! >> Charles >> >> >> >> On May 3, 2013, at 6:01 PM, Doug McNutt wrote: >> >>> At 12:56 -0700 5/3/13, Notgoing Totellyou wrote: >>> I have the CPU card here and its missing a transistor. >>> >>> i can't find a replacement anywhere. >>> >>> Anyone have any lisa parts laying around? >>> >>> it reads : AMPS 4258 EBC >>> >>> you can see the spot behind it, it's missing . >>> >>> \ >>> Transistor Data Book edition 48, 1980 >>> >>> MPS4258 CRI, SPS, MOTO p 153 line 15 which says: >>> >>> Silicon PNP low power >>> 350 mw collector dissipation >>> V cbo 12 V >>> Collector max 800 mA >>> Hfe (gain) 15 >>> >>> >>> I would recommend a very common 2N2907 as a replacement. >>> >>> From the picture it's not altogether clear that transistors Q1 and Q2 are >>> supposed to be the same type.. A pretty common circuit uses PNP and NPN >>> pairs close together. The pair to the 2N2907 is NPN type 2N2222, also very >>> common. (I have a bunch of both here. Use dmcnutt at above off list with >>> Lisa somewhere in the subject.) >>> >>> A look at a working Lisa would be worth while. Anybody here ?? >>> >>> I also have no idea what the A in front of the very common Motorola MPS >>> means. >>> >>> >>> -- >>> >>> Fe++ >>> // \ >>> Fe++ Fe++ >>> | || >>> Fe++ Fe++ >>> \\ / >>> Fe++ >>> >>> -- >>> -- >>> ----- >>> You received this message because you are a member of the Vintage Macs >>> group. >>> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our >>> netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml >>> To post to this group, send email to [email protected] >>> To leave this group, send email to [email protected] >>> For more options, visit this group at >>> http://groups.google.com/group/vintage-macs >>> >>> Support for older Macs: http://lowendmac.com/services/ >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "Vintage Macs" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >> >> -- >> -- >> ----- >> You received this message because you are a member of the Vintage Macs group. >> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our >> netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml >> To post to this group, send email to [email protected] >> To leave this group, send email to [email protected] >> For more options, visit this group at >> http://groups.google.com/group/vintage-macs >> >> Support for older Macs: http://lowendmac.com/services/ >> --- >> You received this message because you are subscribed to the Google Groups >> "Vintage Macs" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> >> -- >> -- >> ----- >> You received this message because you are a member of the Vintage Macs group. >> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our >> netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml >> To post to this group, send email to [email protected] >> To leave this group, send email to [email protected] >> For more options, visit this group at >> http://groups.google.com/group/vintage-macs >> >> Support for older Macs: http://lowendmac.com/services/ >> --- >> You received this message because you are subscribed to the Google Groups >> "Vintage Macs" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> > >-- >-- >----- >You received this message because you are a member of the Vintage Macs group. >The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our >netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml >To post to this group, send email to [email protected] >To leave this group, send email to [email protected] >For more options, visit this group at >http://groups.google.com/group/vintage-macs > >Support for older Macs: http://lowendmac.com/services/ >--- >You received this message because you are subscribed to the Google Groups >"Vintage Macs" group. >To unsubscribe from this group and stop receiving emails from it, send an >email to [email protected]. >For more options, visit https://groups.google.com/groups/opt_out. > > -- -- ----- You received this message because you are a member of the Vintage Macs group. 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