[Hallicrafters] ebay SX-88 and old caps

Carl km1h at jeremy.mv.com
Wed Oct 28 19:34:12 EDT 2009 

There is nothing like leaky caps in the AVC line to give that nice warm 
fuzziness to the audio. Even ones that show no leakage on a Triplett 630 but 
show on a decent cap tester will pass enough enough audio ripple onto the 
AVC line to affect performance.

Dont be foolish, change them all.

Carl
KM1H



----- Original Message ----- 
From: <HallicrafterSX28 at aol.com>
To: <Hallicrafters at mailman.qth.net>
Sent: Wednesday, October 28, 2009 7:19 PM
Subject: [Hallicrafters] ebay SX-88 and old caps


> 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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