Thanks for the advice Skip.?
Did some long transmissions on 40 and indeed the power transistors did get pretty hot. I had not noticed it.?
Went to my box of computer parts and pulled out a nice brushless computer fan. Thought about putting a circuit to turn on the fan when the tx is on. After a couple of minutes I did the more expedient route and wired the fan directly into the power supply It runs anytime the PS is running. My experience with larger heat sinks is that a fan easily Trumps a larger heat sink.?
_Dave_ AD0B