On 11/27/21 2:34 PM, Al via cctalk wrote:
Thank you all for your responses and the leads you have
given, Responses to some of your questions and some more
questions: "Have you checked/measured whether they're
actually faulty?" Yes I have, in the picture I have
provided on the bottom there are
139 is a "nickname" number. IBM used these nicknames for some reason,
instead of the full IBM part number.
A 139 is really an IBM part number 2414938, a silicon device in a TO-18.
Gee, it would be great if this list could take pictures so I could
just post one with all the specs...
--
Will
On S
On 2021-Nov-27, at 11:22 AM, Gregory Beat via cctalk wrote:
>
> 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)
>
> greg
> ==
> From: Al
> To: cctalk@classiccmp.org
> Subject: IBM transistor replacements
>
> Dear all,
>
> A while ago I received an IBM 3286 printer, anno
Apologies for the previous email and it’s disgusting formatting, here is a
second attempt, hopefully it’s readable.
Thank you all for your responses and leads,
Responses to some of your questions and some more questions:
"Have you checked/measured whether they're actually faulty?"
Yes I ha
case (8.5 to 9.5mm diameter)
greg
==
From: Al
To: cctalk@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
On 11/27/21 3:17 PM, Van Snyder via cctalk wrote:
On Fri, 2021-11-26 at 22:33 -0800, Brent Hilpert via cctalk wrote:
On 2021-Nov-26, at 1:52 PM, Al via cctalk wrote:
A while ago I received an IBM 3286 printer, annoyingly some of the
transistors in the printer section have been corroded. What I
Thank you all for your responses and the leads you have given, Responses to some of your questions and some more
questions: "Have you checked/measured whether they're actually faulty?" Yes I have, in the picture I have
provided on the bottom there are the ends of 3 transistor leads. This was on
On Fri, 2021-11-26 at 22:33 -0800, Brent Hilpert via cctalk wrote:
> On 2021-Nov-26, at 1:52 PM, Al via cctalk wrote:
>
> > 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
On 2021-Nov-26, at 1:52 PM, Al via cctalk wrote:
> 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 ty
On 2021-11-26 9:11 p.m., Jon Elson via cctalk wrote:
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 findi
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.
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
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