Cannot find a MDS21 transistor used in my Heathkit AA-1800 power amp board. Any suggestions on an alternative? NPN…300V…500mA…TO-202 Case.
Hello,
Welcome to the DigiKey TechForum. I didn’t have any luck finding a reliable datasheet for part MDS21 but based off your description you can take a look at DigiKey part MJE340GOS-ND as a possible option. It’s not the same package and I’m not sure the pinouts are the same. You will need to verify if this will work as a replacement.