IBM 5100 Power supply old transistor ID? - UK Vintage Radio Repair and Restoration Discussion Forum

Pitou7645 · 20th Apr 2020, 1:43 pm

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!

TonyDuell · 20th Apr 2020, 1:57 pm

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.

Pitou7645 · 4th May 2020, 2:02 am

Just FYI, 2N6545 works fine.

20th Apr 2020, 1:43 pm	#1
Pitou7645 Diode Join Date: Apr 2020 Location: Trois-Rivieres, Quebec, Canada Posts: 4	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! Attached Thumbnails

20th Apr 2020, 1:57 pm	#2
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,066	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.

4th May 2020, 2:02 am	#3
Pitou7645 Diode Join Date: Apr 2020 Location: Trois-Rivieres, Quebec, Canada Posts: 4	Re: IBM 5100 Power supply old transistor ID? Just FYI, 2N6545 works fine.