Timeline for Performance changes to metal can transistors installed 40 years ago
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 26, 2020 at 13:35 | vote | accept | Bort | ||
| Feb 25, 2020 at 22:15 | comment | added | Phil G | There's the possibility of cracking of the carbon and the overmolding material that might cause them to behave erratically under thermal cycling, but if they've had little thermal cycling so far from storage, they should be OK. 217 table 9.1 puts the base reliability as pretty good, but the temperature and power factors increase the failure rates much more dramatically than film or wirewound. | |
| Feb 25, 2020 at 20:56 | comment | added | Bort | I agree that carbon comp resistors are the most suspect parts here, but if they all appear to measure correctly with a typical ohmmeter (we're using Fluke 287s), what other "invisible" problems might appear with ancient carbon comps? | |
| Feb 25, 2020 at 19:55 | history | answered | Phil G | CC BY-SA 4.0 |