[Heathkit] Re: HW-16 and hum.

[Kenneth G. Gordon]

On 29 Jun 2006 at 16:09, Garey Barrell wrote:

> Ken -
> 
> We used the HW-16 as an Autostart RTTY radio back in the late 60's. 
> They were run on 14.075 MHz, crystal controlled, with a Heath 400 Hz
> crystal filter from the SB-300 in the IF.  I seem to recall that there
> was a hum problem, and it was traced to orientation of the AF output
> transformer.  It was at the other end of the chassis, but the windings
> of the two transformers were in the same "plane".  I think moving it
> from the back wall to the side wall reduced the hum considerably.

Ah! I had wondered about that also, since in addition to the power 
transformer, I also have a CHOKE installed where the caps used to 
be. I did this when I couldn't find exact replacament multi-section 
caps. The CHOKE laminations are ALSO in the same "plane" as 
the audio transformer. 

> 
> Also may be all wet!  The old memory bank ain't what it used to 
> be......  :-)

Surely, Sir, you don't feel like the Alone Stranger? :->

Ken W7EKB