[Amps] 400 watt Polyfet HF amplifier

[John Lyles]

Polyfet has a 2014 technical bulletin on their website, TB239. It uses 
their LY942 LDMOS transistor to make a flat 2-30 MHz 400 watt linear 
amplifier with 20 dB gain, using 50 volt parts. Its a compact layout and 
there is a full parts list along with plots. Has anyone built one of 
these?  Its not 1200 or 1800 watts, but has decent 3rd order IMD results 
listed.
73
John
K5PRO