IBM transistor replacements
alsilisk at icloud.com
Sat Nov 27 15:10:03 CST 2021
Thank you, I will see if I can find a modern day equivalent of that and compare them, always useful to have spares on hand.
(Also, apologies for the hideous formatting on my last email, something got very broken somewhere)
> On 27 Nov 2021, at 21:00, Gregory Beat via cctalk <cctalk at classiccmp.org> wrote:
> Al -
> The Texas Instruments (TI) 139 is likely a 2N139 PNP (BJT) transistor,
> capable of high speed switching (in that era).
> The 2N139 was originally an RCA transistor (tall cylinder) found in RCA and GE transistor radios (455 kHz IF section).
> The TI versions were low profile metal case, TO-33 case (8.5 to 9.5mm diameter)
> From: Al <alsilisk at icloud.com>
> To: cctalk at classiccmp.org
> Subject: IBM transistor replacements
> Dear all,
> A while ago I received an IBM 3286 printer, annoyingly some of the transistors in the printer section have been corroded.
> What I am having trouble with is reading the part codes and finding a modern equivalent of them.
> One has a Ti logo and two sets of numbers (attached). Does anybody know which numbers are the part numbers and if they are IBM house numbered?
> Photos of the Ti transistors and card assembly: https://drive.google.com/drive/folders/1JTnsWS4A8NrYJNFsqK2ejOeqqJNjoF1w?usp=sharing
> Thanks in advance,
More information about the cctech