[Hallicrafters] I bet you knew this already.

[Dennis]

Its the dimmer switches that cause most of these problems....  Most new dimmer switches you get at the hardware store for wall switches generate reduced RFI and are usually pretty quiet.  I have one in my shack and I don't hear a thing on any band....  The RFI proof switches have a circuit that switches the lamp only when the AC cycle is crossing zero so NO switching noise (RFI) is generated, works pretty good.

I cant speak to dimmer switches that are a part of lamps.


---- bonddaleena at aol.com wrote: 
> 
> Hi, if you ever have the opportunity to dissect a dead spiral lamp, you 
> will see a 'switching/HV converter' in the base!!!
> 
> Give me a filament bulb any day!!
> 
> ron
> 
> N4UE
> 
> -----Original Message-----
> From: jeff <jeffv at op.net>
> To: Jack Dunigan <jack at dunigandesigns.com>; 
> Hallicrafters at mailman.qth.net
> Sent: Mon, 8 Dec 2008 7:46 pm
> Subject: Re: [Hallicrafters] I bet you knew this already.
> 
> 
> Jack Dunigan wrote: 
> > My radio bench has one of those magnifying lights in which I put one 
> > of those curly, energy saver bulbs. It is bright, runs cool, and 
> > supposedly saves money. When I fire up my Hallicrafters S38-C and 
> > turn on the light, a terrible buzz obliterates all signals on the 
> > lower half of the broadcast band. 
>  
> I had a similar problem with a cheapo computer power supply. In my 
> case, replacing the supply fixed the problem. 
>  
> Not sure what to suggest about the bulbs, short of going back to the 
> `regular' bulbs. I hear they're pretty noisy, although I'm doing ok 
> with them so far. 
>  
> Good luck. 
>  
> -=-=- 
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