[Elecraft] K3 - No speaker output

[Stewart]

My K3's speaker audio seems to have gone West. Audio out of the phones, but 
nothing out of the internal speaker.

It happened when I was installing a new external speaker, a DSP Desktop speaker 
from BHI.

Having read some recent posts about the audio chip blowing up because of using a 
mono plug instead of a stereo one, I made sure that I used a the correct one.

Following guidance in the K3 users manual I connected the speaker to the LH 
channel as I want to use my headset in stereo.

I also took the covers off and checked for the modification involving 470ohm 
resistors. That mod was in place OK.

I switched the K3 and the speaker on and got audio from the speaker. However, 
when I advanced the AF gain on the K3 to about 12 o'clock there was a pop and no 
more speaker audio from the K3.

I have checked the BHI speaker with another rig and it works fine, so my K3 has 
developed a fault.

I can't believe how sensitive it is to damage in the audio output, particularly 
with the care I took to try and avoid this sort of thing happening....

As I am quite OK with SMD's I would appreciate advice on what to change, where 
to get it and how...

Not a happy bunny !

73
Stewart G3RXQ