[Hallicrafters] ebay SX-88 and old caps

Wed Oct 28 21:44:56 EDT 2009


HallicrafterSX28 at aol.com wrote:
> 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
>   
WHAT!
I threw out nearly a shoe box full a couple years back.  Never used.
Like the lotto I missed my fortune again.  Of course I'm the type that 
when " my ship comes in" I'll likely be out flying.  Flying. The best 
way to make a small fortune. Of course you need to start with a large one.

73

Roger (K8RI)
> 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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>>  
>>     
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