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

[Brian Wruble]

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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[Ken Wagner K3IU]

Hi Brian:
You might check the 3/16" diam x 3/16"long spacers at the 5 points
"H"(pg 35) to insure they are installed *without* lockwashers.   Good Luck!
73,
Ken Wagner K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Brian Wruble wrote:

>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.
>  
>


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[Don Wilhelm-2]

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" <[hidden email]>
To: <[hidden email]>
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
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
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> Elecraft web page: http://www.elecraft.com
>
>


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[Brian Wruble]

That's the answer!  Screws were black, face is red!  Thanks.  Brian

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Don Wilhelm
Sent: Friday, July 09, 2004 3:25 PM
To: [hidden email]
Subject: Re: [Elecraft] KPA-100 Q1,Q2,Q3,Q4 screws to heat simk question

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" <[hidden email]>
To: <[hidden email]>
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
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> 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
>
>


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