[Boatanchors] Halli SX-111

[Carl]

Thank you Mark; finally another show of sanity along with Glen and myself.

To some of us its a business working on the old sets, for others its 
perfectionism and pride in workmanship.

OTOH, for some minority its more about being lazy and cheap or just not 
giving a damn.

Since Halli and others changed capacitor vendors between and even during 
production runs I cant buy into a resistance issue unless other components 
were hand selected or bulk changed.

Carl
KM1H



----- Original Message ----- 
From: "Mark K3MSB" <mark.k3msb at gmail.com>
To: "Richard W. Solomon" <w1ksz at earthlink.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Sunday, August 23, 2009 3:50 PM
Subject: Re: [Boatanchors] Halli SX-111


> Hi Dick --
>
> Replace all the BBOD and all the electolytics.   There are two kinds of 
> old
> electrolytics and old paper caps -- those that are bad and those that WILL
> go bad and take something made of unobtanium with them.
>
> I completely recapped my SX-101A last winter, replaced all out of 
> tolerance
> resistors etc, and what a perk up in the old girl!    My SX 111 MK 1 
> hasn't
> been recapped yet (only had it 23 years now....) and it's a great
> performer,  but I know I'm just askin' for it as the saying goes....
>
> Several years ago I worked out the math concerning the series resistance 
> of
> the older caps as it was mentioned that it was actually considered in the
> original circuits.   I posted that stuff on the old AMWindow, and nobody
> commented on it.  So,  either nobody understood it or it was OK.  My
> conclusion was that the increased series resistance of the original caps
> didn't really need to be considered when replacing with more modern caps.
>
> I replace all BBODs, electrolytics etc during a restoration.  Save the
> originals by the way.  Replacing all the BBODs with (say) OD's really 
> isn't
> an authentic restoration,  it's an electrical restoration.  If and when I
> sell any of my old stuff,  the buyer will have the option to have the old
> caps incase they want to restuff them and reinsert them into the circuit.
>
> Also,  do NOT unsolder the old caps;  snip them and leave a pigtail and
> solder onto the pigtail.
>
> http://www.k3msb.com/twiddle/twiddle.html
>
> There is a lot less change of damaging solder lugs.  Also, since I use
> non-authentic Sprague OD's,  I don't want the next owner to have to 
> unsolder
> original solder connections another time and risk damaging the lugs.    If 
> I
> were going to restuff the old BBODs, then I would indeed unsolder 
> everything
> and "do it right".   Take a look at
>
> Your mileage and others may vary.... to each his own....
>
> 73 Mark K3MSB
>
> Mark K3MSB
>
> On Sun, Aug 23, 2009 at 1:03 PM, Richard W. Solomon 
> <w1ksz at earthlink.net>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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