Those particular driver FET's ae easy to replace. They are surface-mount, but they are SOT-89 cases. Just use some solder wick and the edge of an X-Acto knife to pry the part loose while heating the soldered pins.
The FT-817 uses 2SK2975 FET's as the main power output devices. THOSE are quite a bit more difficult to replace, as they are soldered underneath the device. Probably requires a small heat gun to remove a bad device and solder in a new one. The FT-857 and FT-897 put out a lot more power, so those use the 2SK2975 as the drivers and the 2SK2973 as pre-drivers.
73, Zack W9SZ
On Fri, Feb 17, 2023 at 1:59 PM Steven Greenfield AE7HD via <alienrelics=[email protected]> wrote:
It's the drivers I'm replacing, not the finals. But I figured I'd be checking/setting the currents for the drivers, predrivers, and outputs, since I have no idea why these drivers burned up.
