My amp did fail several months ago. Support from telephone to service and finally extremely fast shipping back was excellent. I waited to write this to enable a valid comment. Yes one LDMOS was replaced. Mark at Palstar was confident I would be pleased and explained everything to keep the amplifier stable. I’m so happy I bought a Palstar product. I can’t say enough about their support.
update:
Five months and all is well . I now auto tune then manual tune for 1:0 on amplifier. The antenna swr is a bit higher but the amplifier likes a 1:0 the swr on the antenna usually reads 1:1
Barry K4OCS