Two-stage H.F. linear amplifier[MRF427, MRF428] (1.6MHz to 30MHz power amplifier

[aProgrammer]

pdf article from Wireless World, May 1977

[2N5109]

Since that article was written, inexpensive MOSFET transistors have been developed which are more robust, can generate the same or more power and have more gain and are more stable.  Suggest you look at www.freescale.com for HF power devices and app notes if you are in the market for HF power. 

Ciao,
 
--2N5109