In the circuit I am making repairs two, a BC239 and BC308 are being used to control a 3.6v memory battery charge circuit as part of a 1990 Ahlborn-Galanti digital sampled instrument.
I do have the a slightly newer substitute for the BC239. Thanks Don Resor -----Original Message----- From: WEB via cctalk <[email protected]> Sent: Friday, October 06, 2023 3:03 AM To: [email protected] Cc: WEB <[email protected]> Subject: [cctalk] Re: Obsolete Parts.... Unicorn Electronics On 06.10.2023 03:10, D. Resor via cctalk wrote: > I recently had a need for BC308 transistors. Of course those have > been unobtanium for quite some time. > > My search beyond a distributor then went to eBay where I found Unicorn > Electronics. > > More to the point I see from their website Apple 1, Apple ][ and Apple > 1a Kits along with Apple 1 and Apple II parts are available. > > I thought some here might find this useful. > > https://unicornelectronics.com/ Don, unicorn is known for long for interesting old semiconductors. I have also ordered several parts from there, even from Europe which result in rather high shipping and tax costs. Whether the Apple kits are a good deal though, I have my doubts. The BC308 is the PNP complementary part to the former NPN work horse BC238. Both are nowadays difficult to find. However, as they were rather universal types, you can usually replace them with BC548 (NPN) and BC558 (PNP) today without problems. Holger
