[Elecraft] K1 build issue

[Don Wilhelm]

Bud,

Check the errata sheet that came with your kit, the changes to the 
2SC5739 at Q6 are explained there.  Yes, it is OK to use.
The thermal pads are normally in the Serial Number envelope - open it 
and check.  The thermal pad assists heat transfer from the pad to the 
mounting surface (in the case of Q6 that is the board ground plane), so 
the thermal pads are still required.  If you do not have them, an email 
to parts at elecraft.com with a brief explanation should get them in the 
mail to you.

73,
Don W3FPR

bud73 at comcast.net wrote:
> I am close to finishing building a K1 and am presently about to install the two T-220 power transistors, Q6 and Q7.
> The K1 assembly instructions indicate that Q6 (transmit driver) is a 2SC2166 and is labeled C-2166.  My T-220 package is labeled C-5739.  Is it OK to use the transistor that came with my kit?  Are they electrically the same?
> Also, according to the instructions (pg. 43), I am suppose to mount a "self-adhesive thermal pad" under Q6 and Q7.
> I did not receive any thermal pads with my kit.  As Q6 is a plastic T-220 package, I don't understand why I need a thermal pad under it.  Thanks in advance for any help/suggestions.
>
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