11 Nov
2025
11 Nov
'25
3:26 a.m.
Thanks for the suggestion.
The 2N5771 looks promising on paper.
It is made using "Process 65" which is the same as what was used for the
2n3639.
The 2N5771 is no longer made, but still available from various sources.
I will try to get a few for testing and report back how it went.
Tom
On Tue, Nov 11, 2025 at 3:24 AM Bob Rosenbloom <bobalan(a)sbcglobal.net>
wrote:
Would an 2n5771 (or mmbt5771 SMT) work? They are fast,
used in old
frequency counters, and cheap on eBay.
Bob
On 11/10/2025 10:10 AM, Tom Hunter wrote:
The PN2369 is very different from the PN3639 or 2N3639 we are trying to
find.
Tom
On Tue, 11 Nov 2025, 1:31 am Bob Rosenbloom via cctalk, <
cctalk(a)classiccmp.org> wrote:
On 11/10/2025 12:22 AM, Christian Corti via
cctalk wrote:
--
Vintage computers and electronicswww.dvq.comwww.tekmuseum.comwww.decmuseum.org
On Sat, 8 Nov 2025, Tom Hunter wrote:
It's not too hard to find the plastic versions of the 2N2369, the PN2369.
Mouser has them and so does electronic Goldmine.
Bob
--
Vintage computers and electronics
www.dvq.com
www.tekmuseum.com
www.decmuseum.org
I got hold of some MPSH81. Unfortunately they are
not a suitable
substitute
for a 2N3639 or 2N3640.
[...]