The construction of linear amplifier is common interest of our homebrewer. Because all the SSB transmitter has some kind of the linear amplifier. I will inform you one type of my product. I used it on my 50MHz ssb transceiver. It uses 2SC1957 transistor.
Only with diode , you can make good stability if you choose bias current to make ten times heat lost power may happen on the diode than the maximum input signal power of the linear amplifier.
http://www.intio.or.jp/jf10zl/2sc1957.htm
