[Hallicrafters] SR-400A Cyclone III hum.

[james.liles]

Hi Tom:
The first step in the service/restoration of an SR-400/ SR-400A/SR-2000 is 
to loosen every screw, add a shot of DEox and retighten followed by a shot 
of DEoxit to every ground mount with a slight tap on the star washer to 
reset it.  Most problems will be dispatched.  Kindest regards Jim K9AXN

----- Original Message ----- > Message: 2
> Date: Tue, 15 Dec 2009 04:58:19 -0500
> From: "Tom McDaris" <ab8bw1 at chartermi.net>
> Subject: [Hallicrafters] SR-400A Cyclone III HUM REMOVED
> To: <Hallicrafters at mailman.qth.net>
> Message-ID: <50ECC1C71ED74A8A8AAAAAD7A37D57C9 at jillmcdaris>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I have had an extremely nice SR-400A Cyclone III for some time but have 
> had a problem with receiver hum.  I have been talking it up amongst other 
> enthusiasts with varying results and advice.  The hum was never bad 
> enought to get real serious about so it took me a while to finally do 
> something about it.  I had replaced the filter caps in the supply so what 
> I ended up doing is removing the radio from the cabinet and inspecting the 
> audio output section.  I re-heated some suspicious looking solder joints 
> and really saw nothing that looked out of the ordinary.  When I put it 
> back in the cabinet, that obnoxious hum was gone!  It just goes to show 
> that sometimes it is the simple fix that works!  73 AB8BW Carleton, MI.