[Elecraft] KNB2 Installed, but...

[L Kendall]

Don, thanks.

Larry
K5END

On Sun, 2011-01-23 at 20:50 -0500, Don Wilhelm wrote:

> Larry,
> 
> You probably have some slivers of aluminum embedded in the thermal pads.
> Unless you have some good thermal conductive material laying around, I 
> would request replacement thermal pads from parts at elecraft.com.
> 
> BTW - when you replace the hardware, do not use the internal toothed 
> lockwashers - they can dig out bits of aluminum and cause just the 
> problem you are having.  Substitute split lockwashers.  You may have 
> enough left over from the option installation, normally a few extras are 
> included.
> 
> 73,
> Don W3FPR
> 
> On 1/23/2011 8:43 PM, L Kendall wrote:
> > I built the KNB2 board and installed it today.
> >
> > No problems with that, but it occurred to me while the 100 Watt board
> > was removed to check the TO220 packaged Q7 and Q8 on the RF board for
> > any electrical continuity to the heat sink .
> >
> > I have to back those 4-40 nuts out to barely finger tight or it measures
> > short to ground.
> >
> > Is there a suitable substitute material I can use for those adhesive
> > insulating pads between the transistor and the grounded heat sink?
> > Elecraft p/n in the manual is E700002.
> >
> > Thanks,
> > Larry
> > K5END
> >
> >
> >
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