[Boatanchors] Halli SX-111

[Carl]

WHERE in a 390A?

It certainly wasnt a designed in issue by Collins.

Meanwhile get some decent equipment for the next time you work on a 50 kc IF 
and stop blaming it on the caps.

Carl
KM1H


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <boatanchors at mailman.qth.net>
Cc: "Glen Zook" <gzook at yahoo.com>
Sent: Sunday, August 23, 2009 3:49 PM
Subject: Re: [Boatanchors] Halli SX-111


> Glen,
>
> That is the precise issue I was trying to make clear.
>
> Thank you for clarifying it as a resistance issue!  I thought it was,
> but do NOT have all the high end bench equipment that I had access to a
> couple of decades ago.
>
> I found this particular instance in the SX-101s, and there has been
> discussion of the same in some R-390As.
>
> Bob - N0DGN
>
> Glen Zook wrote:
>> I have found, especially when repairing radios made in the 1930s, that 
>> certain circuits actually need the bypass capacitor to be leaky.  In 
>> those circumstances I add a resistor (usually between 470K and 1meg) in 
>> parallel.  This seems to be true especially in oscillator stages.
>>
>> Glen, K9STH
>>
>> Website:  http://k9sth.com
>>
>>
>> --- On Sun, 8/23/09, rbethman <rbethman at comcast.net> wrote:
>>
>> My experience is indeed the 50kc IF and in the 50.5 kc IF in specifically 
>> in the SX-101s.
>>
>> I began replacing them one at a time.  Then test for function.  I changed 
>> one that was a stage bypass cap and the receiver stopped working.  I went 
>> back, put the pink Tiny Chief back where it just came out of and got the 
>> receive back.
>>
>> I'm not sure if it is inductance or resistance.  I do not have a highly 
>> outfitted bench as some do.  Some things I have to either calculate or 
>> best guess it.  This IS frustrating to say the least.
>>
>> Roy Morgan has also commented on this VERY same thing.  Where in nine 
>> years of archived E-Mail?  I have no clue!
>>
>> It isn't an absolute thing, just something to be aware of.
>>
>
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