To All, Though there is some mention about tightening the screws that mount the final power transistors in the manual, it can be easily missed.
When I first built the KPA100 I made sure the transistor hear sink mounting screws were tight. After operating the rig for about a week (and heat cycling the heat sink) I had an opportunity to open up the K2 to show a friend. At that time something in my mind reminded me to recheck the final transistor heat sink mounting screws (please remember the screws were carefully tightened upon assembly) and to my surprise I could easily tighten the screws 1/2 turn or more! It seems the heat conducting material cold flows a bit between the final transistors and the heat sink. So for those who have a KPA100 it would be prudent to check those final transistor heat sink mounting screws every so often. If you don't you could lose your finals. 73 Dave KD1NA _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
