[Elecraft] K3 speaker amp chip bites the dust again

[Phil Wheeler]

Some years ago I learned to take only expendable 
items to Field Day: Myself :-)

Otherwise I give items to the Club: Those things 
always seem to survive!

Phil W7OX

On 7/1/14, 12:28 PM, Dave Hachadorian wrote:
> I guess I've blown the speaker amp IC in my K3 
> again. This is the third time this has happened, 
> twice in one radio and once in another.
>
> In this case, the radio had both the AF Output 
> Mod Kit (pair of 470 ohm resistors) and the 
> E85056 Audio Protection Assembly Circuit Board 
> installed.
>
> I was operating on Field Day, with headphones, 
> as I usually do, when some onlookers wanted to 
> hear what was going on.  I flipped 
> SPKRS+PHONES=YES, then along came a strong 
> signal, and poof! no speaker audio.
>
> AGC SLP was zero, and AGC THR was 020.  Front 
> panel AGC was FAST.
>
> This failure is really getting old, especially 
> at $120 a pop to get it fixed.
>
> Dave Hachadorian, K6LL
> Big Bear Lake, CA
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