[Elecraft] KX1 - Power Amplifier Q6 Installation Question

[Chuck Stover]

There is a warning in bold letters stating that both washers need to be in place or Q6 will not lay flat against the heat sink pad.

I had difficulty getting the threads started too.  It took several attempts.  I wonder if maybe compressing the split washers in a vise will take enough "spring" out of them to give you the gap needed to get the threads started.

I used the nylon flathead screw to temporarily hold Q6 in place while it was soldered in place.  It survived.  It doesn't have to be real tight.

Chuck K4QS  KX1#2509
--- On Thu, 4/7/11, K8QI <k8qi at embarqmail.com> wrote:

> From: K8QI <k8qi at embarqmail.com>
> Subject: [Elecraft] KX1 - Power Amplifier Q6 Installation Question
> To: elecraft at mailman.qth.net
> Date: Thursday, April 7, 2011, 7:52 AM
> I am currently building Serial #
> 2520.    Going well with no problems found
> during the testing of Phase #1 or
> #2.   Thanks to all for the great
> suggestions to a new kit builder.
> 
> Figure 24 shows the installation of the standoff using 2
> split washers, One
> below and one on top of the board.   I am
> not able to get the threads to
> catch using the 2 washers.    So I only used the
> one on the top of the board
> to maintain the correct heigth of the
> standoff.   I am a little concerned
> that the threads from the 3/16 Pan head and the Nylon 1/4
> Flat Head may
> contact inside the standoff and result in the Power
> Amplifier Q6 being loose
> and not making good contact with the Thermal Pad.  Did
> anyone else have this
> problem?   What was your
> solution?   
> 
> During the solder process for the Power Transistor Q6, the
> instructions
> state to "Temporarily secure Q6 with a 4-40 flat head
> screw....."     My
> question is should I use the nylon flat head or the metal
> flat head for this
> solder step.   Any possibility of deforming
> the nylon flat head during the
> soldering process due to heat transfer?   My
> thought is no, use the nylon.   
> Thought I would ask, since I already have the question
> above.
> 
> If all goes well, I hope to have my new KX1 on the air on
> 20 and 40 meters
> this weekend.
> 
> Thanks and 73,
> 
> Barry K8QI
> 
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