Hi Rob, SANYO 2SD1239 PNP POWER TRANSISTOR TO3 D1239 | eBay UK<https://www.ebay.co.uk/itm/226368697627?_skw=Sanyo+vintage+transistor+TO3&itmmeta=01KE6WR3HZV3HY85PX27W5MHM0&hash=item34b4a0351b:g:yNQAAOSwyr9m8r37&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1e0NqieHkQKjfFYQrMIyqfI%2BQUGEHFe6IyHxeIkeFLA840R603xiOzLKAaa4GGd%2BbeQOKa2dkhZaPMd5%2FJA6lHWNnA8pHUcQZOSdAqvrNQX9CRwtzhCB8IXy5J95zKuhJ410eIQ1QFV5rPjaITQV4rerF%2FqdmTaqByFDfc%2Bur7By0TgkQUqfg5MrfzRqKRcvjuoZzKdBiDhpYan6E00MIQwzzliUhqsGSKVYU%2FV3kvbVy3dwo1JWl9zenZKUSLF%2BlrC7XDrbjmmx2bO5fO1tdBEiX0doTPOuSCvKVyGDT6yUw%3D%3D%7Ctkp%3ABFBMnLng3PFm>
FWIW, logo is Sanyo - these devices on ebay are marked in a very similar manner Peter ________________________________ From: Holm Tiffe via cctalk <[email protected]> Sent: 05 January 2026 08:52 To: General Discussion: On-Topic and Off-Topic Posts <[email protected]> Cc: Holm Tiffe <[email protected]> Subject: [cctalk] Re: Identifying This Component from VT100 Monitor Board Robert Jarratt via cctalk wrote: > I asked this before a few years ago but didn't come to a firm conclusion. The > two parts are shown in this picture: > https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Frjarratt.wordpress.com%2Fwp-content%2Fuploads%2F2023%2F12%2Fimg_20231221_112305.jpg&data=05%7C02%7C%7Ce9f52ab7a3c84f13442e08de4c38e6b6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C639032004445040204%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=sQmoXAFccDkfMos6ZTYHzA9cE4t75BJtCNu0WoqBuSQ%3D&reserved=0<https://rjarratt.wordpress.com/wp-content/uploads/2023/12/img_20231221_112305.jpg> > > They are from a VT100 Monitor board. There is no schematic for my version of > the board, but a related schematic is on p58 of this schematic: > https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbitsavers.org%2Fpdf%2Fdec%2Fterminal%2Fvt100%2FMP00633_VT100_Schematic_Feb82.pdf&data=05%7C02%7C%7Ce9f52ab7a3c84f13442e08de4c38e6b6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C639032004445089260%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Vm3ia1tW6rKFZ%2F9SzaZVCXryBkwlIGzPsPy9JWrMQNk%3D&reserved=0<https://bitsavers.org/pdf/dec/terminal/vt100/MP00633_VT100_Schematic_Feb82.pdf>. > They are labelled Q414 and CR406, but the Feb 82 revision uses a different > board and those two parts are in TO-220 packages rather than TO-3 as here.. > > I have removed both of them and tested them with a DMM. Neither of them > measure as two diodes, they do not measure open circuit in any direction, so > either they are both faulty or they are not transistors (unlikely). I have > found a spec for a 2SB411 at > https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Falltransistors.com%2Ftransistor.php%3Ftransistor%3D10279&data=05%7C02%7C%7Ce9f52ab7a3c84f13442e08de4c38e6b6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C639032004445121661%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=6GpbvfA6UHhY6BMLRyjShGVuAjd4XyclNA3owZr8mf0%3D&reserved=0<https://alltransistors.com/transistor.php?transistor=10279>. > This seems to be a germanium transistor. When I last asked about this I had > a conversation with Tony Duell, who was very sceptical that these could be > germanium transistors, so naturally I am very doubtful that they are 2SB411 > transistors. However, in the schematic Q414 is shown as NPN, the 2SB411 is > PNP and this seems to match the way the part is connected on my board > (Collector to HORIZ GND). I am working on a reverse engineered schematic. > > Can anyone tell me what these components are so I can find a datasheet for > them? Better still a suggested replacement would be really helpful, > especially if they are 2SB411s because they seem to be hard to find. > > Thanks > > Rob I don't think that it where a bigger problem to change them against similar powerful TO220 PNPs. The cooling isn't existent or only has a small heat sink so that the allowed 40W power loss arent used anyways. TO220 Transistors fit easyly on TO3 Footprints. Regards, Holm -- Technik Service u. Handel Tiffe, https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.tsht.de%2F&data=05%7C02%7C%7Ce9f52ab7a3c84f13442e08de4c38e6b6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C639032004445147901%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=hFDWalj%2BsqypAE7GAjkcoNE%2FOzC5WFRmQzOdNA1nTVY%3D&reserved=0<http://www.tsht.de/>, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 [email protected] Tel +49 37292 709778 Mobil: 0172 8790 741
