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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 20th Apr 2020, 1:43 pm   #1
Pitou7645
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Join Date: Apr 2020
Location: Trois-Rivieres, Quebec, Canada
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Default IBM 5100 Power supply old transistor ID?

Hello,

I have an IBM 5100 that has only the +5v and -5v that is working.

I have open the power supply and would like to know the equivalent part number (probably IBM number) for this transistor (see picture).

This Motorola might be very similar to this one (Texas Instruments T484) discussed in this thread here:

https://www.vintage-radio.net/forum/...d.php?t=123369

Thank you very much.

Pitou!
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Old 20th Apr 2020, 1:57 pm   #2
TonyDuell
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Default Re: IBM 5100 Power supply old transistor ID?

It probably is a transistor, but I've come across TO3 packaged devices in old computer power supplies (DEC in my case) which are double diodes, anodes to the 2 pins and common cathode to the case. Used as a biphase rectifier in the obvious way.
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Old 4th May 2020, 2:02 am   #3
Pitou7645
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Join Date: Apr 2020
Location: Trois-Rivieres, Quebec, Canada
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Default Re: IBM 5100 Power supply old transistor ID?

Just FYI, 2N6545 works fine.
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