26 Nov
2021
26 Nov
'21
5:11 p.m.
On 11/26/21 3:52 PM, Al via cctalk wrote:
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.
There are two types.
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?us…
The other is an IBM transistor with what appears to be a 3
digit part code; for which I have been pointed to a list
of house numbering and equivalents on the 1401 website. I
was told the list is much older and I fear it might be out
of date. However there is an entry for the part codes on
my IBM transistors.
Should I trust the list for replacements?
http://ibm-1401.info/BobEricksonIBM-Transistor-Substitution.html
The cards appear to be SLT-style fabrication, it seems there
may even be SLT modules on one of them (the 1/2" square
aluminum-capped blocks.)
The 1401 list would be for SMS cards, they were yellow
paper-phenolic cards with TO-5 and TO-18 discrete Germanium
transistors.? The SLT vintage were generally all Silicon
transistors.
Almost all this stuff had IBM house numbers.
Jon