Quote Originally Posted by N8YX View Post
I would redesign the PA and look at using an MRF device or its equivalent. Have a look at an NTE236 for starters, or a 2SC1969.
I like the MRF458 for HF amps. They are very stable and easily matched. No coupling or feedback issues. Just a good solid performer. My wife closed out all the RF transistors they had down there. I got them for their cost at the time they bought them. Somewhere in the 80s. Bless her heart. There were a lot of MRF245 80w @ 136-176Mhz. And a bunch of low power, med pwr, hi pwr from below 2Mhz up past 500Mhz and some in the micro wave region. Already fixed and sold a bunch of radios, but I have many more to go.