[Elecraft] KPA-100 Q1,Q2,Q3,Q4 screws to heat simk question

[Don Wilhelm]

Brian,

Something is wrong - 1/4 inch screws should be plenty long - dumb question,
are you really using the 1/4 inch screws? - they are NOT the black ones.
The only thing the screw should pass through is the lockwasher and the
transistor (yes the thermal pad too) before it hits the heatsink.  Those
transistors MUST sit in direct contact with the heat sink or they will not
last very long, so do check carefully to be certain there is no gap below
the transistors.

Good luck and 73,
Don W3FPR

----- Original Message ----- 
From: "Brian Wruble" <bwruble at ix.netcom.com>
To: <elecraft at mailman.qth.net>
Sent: Friday, July 09, 2004 3:24 PM
Subject: [Elecraft] KPA-100 Q1,Q2,Q3,Q4 screws to heat simk question


> Hi all:  I am just nearing completion of the 100W upgrade to my K2.  I am
> unable to get the 1/4" 4-40 pan head screws to reach far enough through
the
> board to "catch" the threads in the heat sink UNLESS I leave off the lock
> washers.  Without the lockwashers, everything seems to fit perfectly.
>
> I'd appreciate any thoughts or advice on this.  Thanks.
>
> 73 de Brian W3BW
>
>
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