[Elecraft] KPA100

[David Robertson]

Tom,
The reason for retightening the screws on the KPA Power Transistors is Elecraft uses plastic insulating heatsink pads.  They tend to cold flow a bit under pressure.

Because of the above you should retighten the screws about 2 to 3 days after you first installed them. Operating time is not a factor.

73
Dave KD1NA

-Hello group,
 
-I built the 100 watt amp last summer, but can't seem to overcome the urge to
stay at qrp levels.
 
-So, as I probably have only a few minutes of time at 100 watts, when should
I reset the mounting screws.  Is this like 3 months or 3000 miles or is it
strictly a matter of time?
 
-Should I just pound out a few hours of tests into a dummy?
 
-Thanks,
 
 
-Tom