In that time I build the LimaSDR, I try to build a MOS FET Linear. It works with the Lima so far and on 80m comes near 40 Watts out with the 2 Watts in. The uppers band was the 20m band. On 10m the linear don’t works anymore.
The transistors are under the circuit board
But you need a switchable low pass filter!
Here you can download the Schematics: Endstufe MOSFET.sch