Hi Christian, what do You think about:
2N3640 -> 2N3906 2N3693 -> 2N3904, 2N2222A, BC337-25 Best Andreas Please contact me offlist. > Am 27.10.2025 um 16:38 schrieb Jon Elson via cctalk <[email protected]>: > > On 10/27/25 05:26, Christian Corti via cctalk wrote: >> It seems that nowadays you can't get *any* replacement for failing DEC 3639 >> aka 2N3639 transistors. All parts are obsolete and unobtanium, e.g. 2N3640, >> PN3640, MMBT3640 and so on. >> >> So, what can be used instead? The most important electrical parameter is the >> storage time. It needs to be *very* low, around 20-30 ns. > > Oh, it apparently is Silicon. So, an MPSH81 should really do well. > > Jon >
