Maybe a component in your Astron is aging. I have a 70A Astron that's over 20 years old and it's slightly warm, but that's it. Barry W2UP -- View this message in context: http://elecraft.365791.n2.nabble.com/Power-Supplies-for-K3-tp7575122p7575146.html Sent from the Elecraft mailing list archive at Nabble.com.