HW-16 troubles.

[W5EUQ]

By the way, have you tried replacing the audio tubes.  If one has a 
cathode to filament short, this can cause loud hum too.  Bob

Kenneth G. Gordon wrote:
> My HW-16 has a LOT of hum, especially with the volume control all the 
> way down, and so far, I can't figure out where it is coming from.
>
> I have taken it down the the shop at work and intend to follow the hum 
> around with a scope until I find it. I know it is not coming from any place 
> ahead of the audio amp stages. If I yank the 12AX7 product 
> detector/bfo tube, there is no change.
>
> I also have terribly loud clicks in the headphones or speaker, but not on 
> the air, when keying the darned thing.
>
> I've tried several different methods for minimizing those, but have not 
> yet succeeded in finding a proper cure.
>
> I'm not even sure where it is coming from yet. I know at least one fellow 
> attempted to add a limiter to the receiver to take that out, but it didn't 
> work very well for me.
>
> I wonder if anyone else has had either of these problems and fixed 
> them?
>
> Ken W7EKB
>
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