[Boatanchors] Halli SX-111

[Carl]

Do you have any specific examples Bob?  The only Ive heard mentioned is in 
50 kc IF switched filters and even that is highly suspect.

I suppose one could measure the inductance and compare to the various modern 
film caps. Or take it a step further by breadboarding a filter and then 
trying various caps while watching the shape on a VNA.

I prefer the change them all approach as I dont want to go back in later as 
any paper cap is guaranteed to leak sooner or later. Most likely sooner as 
they get subjected to heat and voltage again. Remember that many so called 
"fully operating" radios were stored for decades which slows down the 
process.  Ive noticed no change in filter curves in a SX-71 or SX-100.  My 
SX-115 was built with disc ceramics

Carl
KM1H


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <boatanchors at mailman.qth.net>
Sent: Sunday, August 23, 2009 1:19 PM
Subject: Re: [Boatanchors] Halli SX-111


> Dick,
>
> Even "some" of the original REAL BBOD's need some thought given before
> simply replacing.
>
> It appears that they had some characteristics that made their use in
> bypass a little unique.  Several folks have had nothing but trouble with
> the complete removal of all BBODs.  I've only replaced those in my
> SX-101 MkIII that were in a critical circuit that would cause circuits
> to llet the smoke out.
>
> Other than that, There are still a lot of radios that have them from the
> original installation and work fine.  Sometimes I check to see what
> shape they are in by lifting one leg and running my C-3 capacitor tester
> on them.
>
> It is somewhat a darned if you do and darned if you don't.  When in the
> IF area, don't simply go crazy.
>
> As to the "second generation", I think you are referring to the pink
> ones.  They are NO different, and are original.
>
> I've got that same mixture in the HT-32 and the SX-101 MkIII.
>
> Both radios work fine.  Still!
>
> Bob - N0DGN
>
> Richard W. Solomon wrote:
>> I just acquired a Halli SX-111 that should clean up nice after I
>> get rid of all the desert dust !!
>>
>> Any problem areas I should look at before I start applying power
>> (of course after checking/re-forming power supply caps).
>>
>> I notice some caps that look like next generation BBOD's, they
>> seem in good shape. Do they suffer from the same fatal disease
>> as their older counterparts ?
>>
>> 73, Dick, W1KSZ
>>
>
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