HW-16 troubles.... An idea....

[Claude]

Hi Ken,
          If the hum was just coming from the headphones, I would suspect a wrong impedence headphone being used. If by chance the speaker may have been upgraded, the wrong inpedence speaker cpuld have been used also. 
          In the Good Old days (40 + years ago) I had a Drake TR4-C one of the very fist ones to come out, and that output that would make a lot of hum in the headphones unless the proper impedence headphones was used....
          Wouldn'y it be nice if this was the trouble..... hi hi
                                        Claude  WB4WHH
           

"Kenneth G. Gordon" <kgordon2006 at VERIZON.NET> 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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