[cctalk] Re: Replacements for DEC 3639

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 &lt;bobalan(a)sbcglobal.net&gt; 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&gt; wrote: > >> On 11/10/2025 12:22 AM, Christian Corti via cctalk wrote: >> > On Sat, 8 Nov 2025, Tom Hunter wrote: >> >> I got hold of some MPSH81. Unfortunately they are not a suitable >> >> substitute >> >> for a 2N3639 or 2N3640. >> > [...] >> >> 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 >> >> > > -- > Vintage computers and electronicswww.dvq.comwww.tekmuseum.comwww.decmuseum.org > >