Ameritron AL-811 Ameritron HF Power Amplifiers | DX Engineering
HF Power Amplifier, Good Heat Dissipation 3-5W Input DC12-16V 1.5-54MHz Low Power Amplifier for CW AM FM HAM Radio(#1) : Amazon.co.uk: Electronics & Photo
FRINEAR-150 RF amplifier with 1 × EL519(PL519)
sv3eao & sv3eap (2kw HF linear amplifier)
PG1N's HAM Radio Site - Multiband HF Projects - Amplifiers