[Hammarlund] vibrating hum on sp600?

[Edward B Richards]

Check your B+ current first thing. If it is OK, the hum is probably loose
laminations, not harmful. Tighten all the hardware on and around the
transformer. If that does not help, try wooden wedges between the winding
and the core. BE CAREFUL!. Good luck.

73, Ed Richards K6UUZ
AMI member #1534


On Thu, 31 Mar 2005 17:03:35 +0000 "Eugene Hertz" <ehertz at tcaf.org>
writes:
> Hello all,
> 
> Just received my GenRad 1001A rf generator and have been starting to 
> learn about how radios work and how to use test equipment with them. 
>  Had a question.
> 
> When I turn on my sp600 with the rf and af gain set to "0" I can 
> hear an audible hum coming from either the big transformer or the 
> shorter one right next to it, I am not sure. It is 60Hz, but appears 
> to be a mechanically produced sound vs from a speaker or any audio 
> chain.  Kinda like if you walk by some of the very very large 
> transformers used in power distribution, even tho there are no 
> speakers you can hear these transformers "buzz"  In my case, the 
> sound is very low, but somehow annoys me!  Question is, is this 
> normal? Is this portending some disaster with a transformer? Could 
> additional caps help this? The audio of the radio is very quite with 
> no hum whatsoever.
> 
> 
> 
> 
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