[Hallicrafters] ebay SX-88 and old caps

HallicrafterSX28 at aol.com HallicrafterSX28 at aol.com
Wed Oct 28 19:19:18 EDT 2009 

In a message dated 10/28/2009 4:06:43 PM Pacific Daylight Time,  
Julian.Bunn at caltech.edu writes:

I think  the leaky old caps just sound better on AM. Those modern
Orange Drop things  sound so clinical and lifeless :-)

Yeah ,this reminds me that these 'AUDIOFOOLS' are paying BIG BUCKS for  
these leaky old BB capacitors
on ebay! The argument 'the old caps sound better' !!


In  my limited experience, the old resistors (especially the higher
value ones)  in these Hallicrafters are usually way off, too: so much
so that it always  makes me wonder how the circuit can work at all,
even poorly. Perhaps it's  not so critical after all?

Well depends where the resistor is sitting in the circuit .The critical  
ones are the cathode biasing and the screen drop resistors.


Julian


rbethman wrote:
> I don't have any  weird beliefs regarding those old caps.  The biggest 
> problem  I've had is when replacing "some", that I've had to adjust their 
>  values with the newer film type capacitors.  I have attributed most of  
> it to the broad tolerance of the old parts from day one.
>  
> You would find ranges of -20% through +80% and much worse in the old  
> plastic tubular paper caps.  Yes, they ALL leak now.  I  don't know how 
> good they really were, but that's what some  manufacturer's used.
> 
> As to what voltage is or isn't on them,  it won't matter!  They are a 
> mess with failure a sure thing if  left in there.
> 
> He'd be better off with either restuffing the  old ones, or simply 
> replacing them too.
> 
> Bob -  N0DGN
> 
> HallicrafterSX28 at aol.com wrote:
>> so do the  AVC and Cathode bypass caps they don't have any significant  
>>  voltages across them either but they are plagued with leaakage just  
like  all 
>> the other capacitors in the rcvr.
>>  Regards
>> Nick
>>  
>>  
>> In  a message dated 10/28/2009 3:17:54 PM Pacific Daylight Time, WA1KBQ  
 
>> writes:
>>  
>> That's not  correct,  they tested OK probably because they don't have 
>> voltage on  them.
>>
>>  
>> Regards,  Greg
>>  
>>  
>> In a message dated  10/28/2009 3:04:09 P.M. Atlantic Standard Time,  
>>  hallicraftersx28 at aol.com writes:
>>
>>
>>  Interestingly the guy didn't replace  the black  beauities mounted  on 
the 
>> wafer switches (that control the IF passband).They   are just as bad as 
the 
>> other.
>>  Nick
>>
>>
>> -----Original   Message-----
>> From: Julian Bunn  <Julian.Bunn at caltech.edu>
>> To:   radioart at frontiernet.net
>> Cc: w9xf at comcast.net; List  Hallicrafters  
<hallicrafters at mailman.qth.net>
>> Sent:  Wed, Oct 28, 2009 11:41  am
>> Subject: Re: [Hallicrafters] ebay  SX-88 - Wow!
>>
>>
>>
>> Yes,   superb. Looks pristine. I'm an SX-88 novice: what are the   
unlabelled
>> hrome knobs beneath each tuning dial used  for?
>> If I had  this, plus the Tek 570 tube tester currently  on auction, I 
would
>> ie  happy.
>>  Julian
>>
>> radioart at frontiernet.net wrote:
>> Guy  did a nice  job restoring it....  Looks better than  NEW!
>>
>> Dennis  Petrich
>> Amateur Radio  Station K0EOO
>> Lakeville Minnesota  USA
>>  k0eoo at arrl.net
>> 952-898-1082
>>
>> ----- Original  Message  -----
>> From: w9xf at comcast.net
>> To: List  Hallicrafters  <hallicrafters at mailman.qth.net>
>> Sent:  Wed, 28 Oct 2009 18:22:13  +0000 (UTC)
>> Subject:  [Hallicrafters] ebay SX-88 - Wow!
>>
>> Way too  rich  for my blood, but it looks like someone did a lot of 
detailed  
>>  
>> estorative work on it.  
>>
>> 73, 
>>
>> W9XF   
>>
>>
>>  
http://cgi.ebay.com/HALLICRAFTERS-SX-88-TIME-MACHINE-RESTORED-TO-PERFECTION_
>>  
W0QQitemZ110450151577QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19b75790
>>  99  
>>   
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