Somehow [hvde] wound up with a CB radio that does AM and SSB on the 11 meter band. The problem was that the radio isn’t legal where he lives. So he decided to change the radio over to work on… ...

Yes, as @Seth says for the power amplifier use a few BS170 N-channel enhancement mode MOSFETs in parallel just like they are used on the QRP-Labs Ultimate3S QRSS/WSPR transmitter kit.