[Elecraft] PA Transistors Maintenance in K2

[Victor Rosenthal 4X6GP]

On page 51 of the Rev 2 KPA100 manual, I found the following:

------------------
IMPORTANT: The hardware holding the RF power
transistors in place will loosen slightly during initial use.
After 5-10 hours of normal operation at 50 watts or more,
remove the KPA100 assembly and its shield, then re-tighten
the mounting hardware for Q1/Q2 approximately 1/8 turn.
-------------------

I didn't look to see if this was in other versions of the manual; this 
was the first place I looked.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 28 Oct 2017 06:15, Dauer, Edward wrote:
> I vaguely remember reading somewhere that after some number of hours of operation – maybe 50 – the hardware holding Q7 and Q8 onto the heat sink should be tightened, I presume to maintain good heat conduction from the tabs to the sink.  But I can’t find that instruction in the manual now.  Anyone know where I might have gotten that notion, or did I just make it up?
> 
> Thanks,
> 
> Ted, KN1CBR