I found these units to be adequate I've had to replace one due to poor swr. The unit overheated let the smoke out. This last one has worked over a year and is utilizied almost 24/7. https://www.ebay.com/sch/163853/i.html?_from=R40&_nkw=power+amplifier+hf&LH_TitleDesc=0&_sop=15&LH_PrefLoc=2 73, Chuck, N7CHS