[Elecraft] Securing Q3 and Q4 on KPA100

Fri Aug 16 16:45:01 2002

Roy:
  Are #4 nylon washers suitable to this task? or is there a heat problem 
with them?  I have some nylon washers, which, I believe, are 1/16" thick in 
#4.

thanks,

dave belsley, w1euy

--On Friday, August 16, 2002 2:42 PM -0400 [email protected] wrote:

> Gary Surrency has suggested that Q3 and Q4 be secured to the heat sink
> with a  thick fiber washer (like the speaker washer) rather than the
> split washer  that can bite into the plastic transistor body and damage
> it.  Fiber washers  about the size of the speaker washers can be found at
> Home Depot.  The  washers to use are the #4 x .032".  The hole in these
> washers are slightly  larger than the screw diameter which should let the
> washer seat properly if  the transistor is not in perfect alignment with
> the PCB hole.  I am not using  the split washer on top of the fiber
> washer, and I don't believe Gary uses  the split washer on top of the
> fiber washer either.  If these screws are  tightened with normal torque,
> they will stay put.  Roy Morris  W4WFB  K2/100
># 2225
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David A. Belsley
Professor of Economics