[Johnson] Ranger VFO help

[K6JEK]

My Collins collector friends tell me silver micas are becoming a 
problem.   Just a few years ago the assumption was  micas and ceramics 
were fine.  Now they think it's 50/50 on the silver micas and some guys 
have taken to replacing them routinely just as they do with fifty year 
old paper caps.

So I plan to replace the silver micas.  But if any of those odd value, 
negative temperature coefficient  caps are gone, I'll be scrambling to 
replace them.

Jon


On May 29, 2006, at 6:18 AM, Jim Brannigan wrote:

> Added to the other good advice, don't overlook the silver micas in the 
> VFO.
> Silver micas are not usually a problem, but mine were.
> With the hassle of removing the hardware to get at the VFO, I replaced 
> them all and the problem was gone.
>
> Jim
>
>> Glen, Ed,
>>
>> Thanks for the advice.   I should have mentioned that tightening all 
>> the ground screws and nuts I could get to was the first thing I did.  
>>  I'd read Glen's posts about that.   I tightened one inside the VFO 
>> compartment, one I could access with just the side panel off.  There 
>> may be more.  I'll be sure to check that inside-the-VFO wafer switch. 
>>   Plain old bad solder connections are not out the question, too.
>>
>> Jon
>>
>>
>> On May 28, 2006, at 5:20 PM, Glen Zook wrote:
>>
>>> Try tightening all of the screws, nuts, etc., that go
>>> through the chassis (and VFO box).  All of the grounds
>>> in the unit are made through these and they work loose
>>> over the years.  All sorts of problems then happen.
>>> When the fasteners are again tight I have found that
>>> at least 95% of the "screwy" problems disappear.
>>>
>>> Glen, K9STH
>>>
>>>
>>> --- K6JEK <k6jek at comcast.net> wrote:
>>>
>>> The VFO puts out a nasty, raspy signal, quite audible
>>> on the final signal and ugly on the scope.
>>>
>>> Any ideas on how I should go about finding this
>>> problem?
>