[Hallicrafters] SX-100 oval power cord, etc

[Ron]

The saving grace is that most of this old boatanchor equipment  isn't 
operated as much as it is looked at and then usually only one piece in a 
stack at a time is turned on.    Also most of the vintage stuff had so 
much room around all the parts that heat really wasn't as big an issue 
as some of the modern stuff that generates heat with no way for it to 
escape.   Icom's 756Pro I have been told has this problem.  None of 
this  equipment is going to get 24/7 treatment. 

Ron  WA0KDS





Bruce Wright wrote:

> Mike, et al...
>
> Okay, my comments cover no new ground here, but some ideas worth 
> remembering.
>
> Certainly Mike's external fan is a good idea insofar as it is also 
> cooling other components, including the power transformer and filter 
> cap next to the 5Y3...the former, very expensive if not near 
> impossible to replace for some gear.
>
> It does amaze me to see operating desks and tables with vacuum tube 
> gear having other equipment and accessories stacked (or tightly 
> packed) atop one another...sometimes 3 and 4 tiers...This observation 
> is true from the early pages and covers of amateur radio literature as 
> well as current shacks of local friends and acquaintances...This 
> practice is, potentially (no pun intended), all the more dangerous 
> today because much of the vintage gear designed to run at 110 to 115 
> volts is asked to run on AC mains at or above 120 volts, creating even 
> more heat.
>
> In addition to the regard for adequate ventilation of the radio 
> chassis and cabinet, I have also replaced the standard shiny metal 
> tube shields with IERC types to help lower the operating temperature 
> of the 7- and 9-pin miniature tubes...Although expensive today, INMHO, 
> these shields are worth the investment.
>
> 73,
> Bruce
> WC5CW
>
>
>
>
>
>
>> From: TchrMe at aol.com
>> To: shortwaves at msn.com, hallicrafters at mailman.qth.net
>> Subject: Re: [Hallicrafters] SX-100 oval power cord, etc
>> Date: Tue, 20 Jul 2004 20:07:50 EDT
>>
>> Fellow List Members,
>>      I also have an early Mk II with the original knob style. Recently I
>> replaced the filter caps, the wax caps as well as any out of spec 
>> resistors, and
>> realigned it. My rcvr is sitting in a bookshelf with a small pancake fan
>> (fastened to the bottom of the next shelf up) blowing across the top 
>> over the
>> rectifier tube to help it run cooler. After the first few min of 
>> operation, it is
>> stable on SSB and I have not had any drifting problems. These fans 
>> are cheap and
>> really help the tube gear run cooler.
>>    As far as the pwr cords, I always thought they were all two conductor
>> hardwired to the chassis. I have never seen the 3 wire cords stock on 
>> a Halli. and
>> I have a lot of them in my collection.
>>                                             73 Mike KF6KXG
>
>
>
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