http://www.seboldt.net/k0jd/mot-an762.pdf
http://www.om3bc.com/datasheets/mrf421.pdf
"The MRF421 with a specified power output of 100 W PEP
or CW is the largest of the three RF devices. The maximum
dissipation limit is 290 Watts, which means that the
continuous collector current could go as high as 21.3 A at
13.6 V operated into any load. The data sheet specifies 20 A;
this is actually limited by the current carrying capability of
the internal bonding wires. The values given are valid at a
25°C mount temperature."
Are you suggesting that the (admittedly dated) reference to the MRF421 as a 100 watt device is capable of in excess of 180 watts as a single ended device?
Helge did.
https://cache.nxp.com/docs/en/application-note/AN749.pdf
So there are the combiners.
Now back to the MRF421. Even in a single frequency, tuned circuit, with adequate cooling I have never seen in excess of 110 watts for any length of time. I lived with this sand state for over two years. It's one of the few BJT's I actually know anything significant about. Even if you eliminate the broadband push pull losses you still have the losses in the combiner(s). TANSTAAFL. Any gains in single ended implementation (actually theoretically possible) result in minimal percentage gains in efficiency at the expense of bandwidth necessitated by higher "Q" . These gains in no way equal half of the transistors useful output power.
